[chore] test metrics and profiling with auto-instrumentation

[jinja2]

Description:

Add functional test coverage for auto-instrumentation metrics and profiling across
all Splunk-supported languages (Java, .NET, Node.js, Python).

Changes:

• New auto_instrumentation_test.go with per-language metrics and profiling subtests,
  matched by telemetry.sdk.language + service.name
• Refactored shared helpers out of functional_test.go
• Python and Node.js test app Dockerfiles changed from Alpine to Slim: auto-instrumentation images have native extensions compiled against glibc (e.g. psutil/grpcio for Python, the C++ profiling addon for Node.js) and I couldn't runtime metrics for Python and profiling data for nodejs to work with the our Alpine (musl libc).
• Makefile + CI build these images locally and load into Kind via kind load docker-image (TODO - push these updated images to quay)
• Added SPLUNK_METRICS_ENABLED to node instrumentation config in test values. Without this var, no metrics are exported from Node.js.

[jinja2]

Without this var, no metrics are exported from Node.js. Only set in the test values for now, but will check with product about whether this deviation from other languages default behavior is expected.

[Copilot]

Pull request overview

Adds functional test coverage to validate Splunk auto-instrumentation emits expected runtime metrics and profiling signals across supported languages, and updates the kind/CI flow to build compatible test-app images locally.

Changes:

• Added per-language functional subtests for auto-instrumentation metrics and profiling, matched by telemetry.sdk.language + service.name.
• Refactored/moved auto-instrumentation trace test helpers into a dedicated test file and updated shared metric-check helpers.
• Switched Python/Node.js test app images from Alpine → Slim and added Makefile/CI steps to build + kind load these images.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
functional_tests/functional/testdata/values/test_values.yaml.tmpl	Enables profiling in test values and overrides nodejs metrics env + adds o11y HEC exporter endpoint for profiling.
functional_tests/functional/testdata/python/Dockerfile	Moves Python test app base image to python:3.13-slim and updates package install/pip flags.
functional_tests/functional/testdata/nodejs/Dockerfile	Moves Node.js test app base image to node:18-slim and updates package install commands.
functional_tests/functional/functional_test.go	Adds new local-cluster subtests for metrics/profiling and refactors metric assertion helpers.
functional_tests/functional/auto_instrumentation_test.go	New file containing auto-instrumentation trace tests plus new metrics/profiling validations.
Makefile	Adds kind-build-test-images and wires it into functionaltest-local.
.github/workflows/functional_test_v2.yaml	Builds + loads the updated test images into kind before running functional tests.

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

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