Update more deps

[rukai]

More updates:

• rand, provides random number generation
  • the Rng crate was renamed to RngExt
  • thread_rng feature is now required, technically this was always required, but another one of our dependencies was pulling in the feature, so we didnt need to do it ourselves. Since we are now on rand 0.10, and that dependency is still using 0.9, it is no longer pulling in thread_rng feature for the version of rand that we use, so we need to set that feature ourselves
• rdkafka, delivery status is now stored as a struct instead of a tuple - nice!
• metrics-exporter-prometheus, it now processes the name of one of our metrics differently to avoid the double _count_count naming.
  • the only metric affected by this is deprecated, so rather than rename it I've removed the metric entirely.

[codspeed-hq]

Merging this PR will not alter performance

✅ 36 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing rukai:update-more-deps (45d1b8b) with main (37cdad6)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Copilot]

Pull request overview

Updates several Rust dependencies (notably rand, rdkafka, and metrics-exporter-prometheus) and adjusts the codebase/tests to accommodate API/behavior changes, including removing a deprecated metric that now renders poorly in Prometheus output.

Changes:

• Bump deps: rand (workspace), rdkafka (test-helpers), metrics-exporter-prometheus (shotover), lz4_flex (shotover), plus Cassandra-related deps in the workspace.
• Update code to match new APIs (e.g., rand::RngExt, rdkafka delivery status struct fields).
• Remove deprecated shotover_chain_messages_per_batch_count metric and update observability integration test expectations.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test-helpers/src/connection/kafka/cpp.rs	Adjusts rdkafka delivery status access from tuple to struct fields.
test-helpers/Cargo.toml	Bumps rdkafka dependency version.
shotover/src/transforms/kafka/sink_cluster/shotover_node.rs	Updates rand trait import to RngExt.
shotover/src/transforms/chain.rs	Removes deprecated metric emission.
shotover/Cargo.toml	Updates dependencies (incl. metrics-exporter-prometheus, lz4_flex) and changes rand dependency spec.
shotover-proxy/tests/valkey_int_tests/basic_driver_tests.rs	Updates rand imports to new trait naming.
shotover-proxy/tests/runner/observability_int_tests.rs	Removes expectations for the deleted deprecated metric.
shotover-proxy/tests/cassandra_int_tests/routing.rs	Updates rand imports to new trait naming.
shotover-proxy/tests/cassandra_int_tests/batch_statements.rs	Updates rand import to RngExt.
changelog.md	Adds 0.8.0 changelog entries for metric and transform removals.
Cargo.toml	Bumps workspace deps (cdrs-tokio, cassandra-protocol, rand).
Cargo.lock	Lockfile updates reflecting dependency bumps.

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