Don't leave multiple threads hanging during testing

[esnible]

For #56

Many of the tests start threads that hold open resources and don't release them until the entire cargo test terminates. This keeps the tests from running on the Mac and other resource-constrained environments.

With these changes, all integration tests but one now pass on the Mac.

This PRs entire purpose is to shut down resources when each test exits. This should make the integration tests use less resources on any system. The changes aren't Mac-specific.

[Copilot]

Pull request overview

This PR updates the Rust integration-test utilities and test suites to avoid leaking background threads/resources by introducing RAII guards for spawned proxy/backend servers and updating tests to hold those guards for the test lifetime.

Changes:

• Introduce ProxyGuard (Pingora server shutdown on drop) and BackendGuard (TCP backend shutdown on drop) in tests/utils.
• Add new *_with_shutdown backend helpers and update many tests to use guards and proxy.addr() instead of raw address strings.
• Update tests/utils crate dependencies to support Pingora shutdown signaling (pingora-core, async-trait, tokio/sync).

Reviewed changes

Copilot reviewed 111 out of 112 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/utils/src/proxy.rs	Add ProxyGuard and spawn helper using Pingora shutdown signal watch.
tests/utils/src/net/mod.rs	Re-export new backend guard helpers.
tests/utils/src/net/backend/specialized.rs	Add BackendGuard and spawn_tcp_server_with_shutdown.
tests/utils/src/net/backend/simple.rs	Add Backend::start_with_shutdown and start_backend_with_shutdown.
tests/utils/src/net/backend/mod.rs	Re-export BackendGuard and new *_with_shutdown helpers.
tests/utils/src/net/backend/echo.rs	Add echo backends that return BackendGuard.
tests/utils/src/lib.rs	Re-export ProxyGuard from test utils crate.
tests/utils/Cargo.toml	Add async-trait, pingora-core, and enable tokio/sync.
tests/smoke/tests/suite/smoke.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/request_smuggling.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/ip_acl.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/info_leakage.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/host_header.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/header_injection.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/forwarded_headers.rs	Hold ProxyGuard and use proxy.addr().
tests/security/tests/suite/filter_leakage.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/throughput_simple.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/throughput_production.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/throughput_filter_chain.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/throughput_body.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/rate_limit_burst.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/multi_listener_isolation.rs	Keep proxy alive via _proxy guard binding.
tests/resilience/tests/suite/large_payload.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/concurrent_load.rs	Hold ProxyGuard; clone proxy.addr() for threads.
tests/resilience/tests/suite/backend_recovery.rs	Hold ProxyGuard and use proxy.addr().
tests/resilience/tests/suite/backend_failure.rs	Hold ProxyGuard and use proxy.addr().
tests/integration/tests/suite/url_rewrite.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/tcp_access_log.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/security.rs	Use header-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/routing/path_based.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/routing/listeners.rs	Use backend shutdown helpers and keep proxy alive via guard.
tests/integration/tests/suite/routing/infrastructure.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/routing/host_based.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/routing/filters.rs	Use backend shutdown helpers and ProxyGuard for custom registry case.
tests/integration/tests/suite/routing/basic.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/retry.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/rate_limit.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/per_listener_pipeline.rs	Use backend shutdown helper and keep proxy alive via guard.
tests/integration/tests/suite/path_rewrite.rs	Use URI-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/json_body_field.rs	Use header-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/ip_acl.rs	Use backend shutdown helpers and keep proxy alive via guard.
tests/integration/tests/suite/health_check.rs	Use backend shutdown helper for stable backend in health-check tests.
tests/integration/tests/suite/filter_composition.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/weighted_load_balancing.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/virtual_hosts.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/timeout.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/stream_buffer.rs	Return (BackendGuard, ProxyGuard) from setup; use guards in tests.
tests/integration/tests/suite/examples/static_response.rs	Hold ProxyGuard and use proxy.addr().
tests/integration/tests/suite/examples/session_affinity.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/round_robin.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/redirect.rs	Hold ProxyGuard and use proxy.addr().
tests/integration/tests/suite/examples/path_rewriting.rs	Use URI-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/path_based_routing.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/multi_listener.rs	Use backend shutdown helpers (multi-listener example).
tests/integration/tests/suite/examples/model_to_header.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/max_body_guard.rs	Use backend shutdown helper and ProxyGuard for registry-based proxy.
tests/integration/tests/suite/examples/logging.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/least_connections.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/header_manipulation.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/default_config.rs	Hold ProxyGuard and use proxy.addr().
tests/integration/tests/suite/examples/conditional_filters.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/canary_routing.rs	Use backend shutdown helpers and ProxyGuard.
tests/integration/tests/suite/examples/basic_reverse_proxy.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/examples/api_key_filter.rs	Use backend shutdown helper and ProxyGuard for registry-based proxy.
tests/integration/tests/suite/examples/access_logging.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/downstream_read_timeout.rs	Use backend shutdown helper and ProxyGuard (including raw TCP connect).
tests/integration/tests/suite/conditions.rs	Use header-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/compression.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/adversarial/rate_limit_bypass.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/adversarial/path_traversal.rs	Use URI-echo backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/adversarial/ipv6_bypass.rs	Use backend shutdown helper and ProxyGuard for v4/v6 cases.
tests/integration/tests/suite/adversarial/host_header.rs	Use backend shutdown helper and ProxyGuard.
tests/integration/tests/suite/adversarial/header_smuggling.rs	Use backend/header-echo shutdown helpers and ProxyGuard.
tests/conformance/tests/suite/tls.rs	Update TLS proxy helpers to return/hold ProxyGuard.
tests/conformance/tests/suite/rfcs/rfc9113.rs	Use ProxyGuard and proxy.addr() for HTTP/2 conformance tests.
tests/conformance/tests/suite/rfcs/rfc7239.rs	Use ProxyGuard and update wrapper to return ProxyGuard.
tests/conformance/tests/suite/rfcs/rfc6265.rs	Use ProxyGuard and proxy.addr().
tests/conformance/tests/suite/ipv6.rs	Use ProxyGuard and proxy.addr() for v6 tests.
tests/conformance/tests/suite/h2spec.rs	Use ProxyGuard and proxy.addr() before invoking h2spec.
tests/conformance/tests/suite/cors.rs	Use ProxyGuard and proxy.addr().
tests/conformance/tests/suite/chunked.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/transformation/header_manipulation.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/weighted_load_balancing.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/virtual_hosts.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/timeout.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/static_response.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/session_affinity.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/round_robin.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/path_based_routing.rs	Use ProxyGuard and proxy.addr() (retry variant).
tests/configuration/tests/suite/examples/traffic_management/least_connections.rs	Use ProxyGuard and proxy.addr() (incl. concurrent case).
tests/configuration/tests/suite/examples/traffic_management/canary_routing.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/traffic_management/basic_reverse_proxy.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/pipeline/default_config.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/pipeline/conditional_filters.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/payload_processing/stream_buffer.rs	Update to ProxyGuard usage (but backend still starts without shutdown guard).
tests/configuration/tests/suite/examples/observability/logging.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/observability/access_logging.rs	Use ProxyGuard and proxy.addr().
tests/configuration/tests/suite/examples/max_body_guard.rs	Use ProxyGuard and proxy.addr() for registry-based proxy.
tests/configuration/tests/suite/examples/api_key_filter.rs	Use ProxyGuard and proxy.addr() for registry-based proxy.
tests/configuration/tests/suite/examples/ai/model_to_header.rs	Use ProxyGuard and pass proxy.addr() into http_post.
Cargo.lock	Add/adjust dependencies due to new tests/utils requirements.

accidental

[shaneutt]

Ignoring the PR size failure for this one.