[BLD]: move GC proptest into separate job

[codetheweb]

Description of changes

The wall time of Rust integration tests is now ~18m, down from ~22m.

Test plan

How are these changes tested?

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[propel-code-bot]

Separate Slow GC Integration Test into Distinct CI Job to Speed Up Rust Integration Tests

This PR restructures the Rust CI integration test workflow by isolating the slow 'test_k8s_integration_garbage_collection' test into its own matrix job using a new nextest profile (ci_k8s_integration_slow). The configuration ensures standard integration tests exclude this slow test, running it separately to reduce overall CI wall clock time from ~22m to ~18m. Related updates to .github/workflows/_rust-tests.yml and .config/nextest.toml streamline the partitioning and grouping of test execution.

Key Changes:
• Created a new ci_k8s_integration_slow nextest profile to run only the garbage collection integration test.
• Modified the ci_k8s_integration profile to exclude the GC test, allowing other integration tests to run concurrently.
• Updated the CI workflow (_rust-tests.yml) to include both fast and slow test profiles as distinct matrix entries, with proper partitioning strategy.
• Expanded naming and artifact conventions in integration test jobs for clarity.

Affected Areas:
• .github/workflows/_rust-tests.yml
• .config/nextest.toml

This summary was automatically generated by @propel-code-bot

[eculver]

These partitioning options are a little magical to me, but I'll take your word for it.