[TST] Make work queue integration test order-agnostic

[rescrv]

Description of changes

The live fn-consumer can defer an item while this test runs, moving
it to the back of the queue and breaking the previous FIFO-order
assertion. Verify each retrieved item by matching its fn_id to the
expected completion offset instead of relying on push order.

Rename the test to test_k8s_integration_work_queue_enqueue_and_filtering
to reflect that it checks enqueue and filtering rather than FIFO
ordering, which remains covered by the QueueState unit tests.

Test plan

CI

Migration plan

N/A

Observability plan

N/A

Documentation Changes

N/A

Co-authored-by: AI

[claude]

Claude Code Review

This repository is configured for manual code reviews. Comment @claude review for a one-time review, or @claude review always to subscribe this PR to a review on every future push.

_{Tip: disable this comment in your organization's Code Review settings.}

[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)