[GSoC-273] Feat: Integrate TestPubsubContext to prevent Pub/Sub resource leaks and expand stale cleaner scope

[HansMarcus01]

Overview

This pull request improves the lifecycle management of Pub/Sub resources in our integration tests to actively reduce GCP consumption. It replaces manual teardown methods with the robust TestPubsubContext manager and expands the automated garbage collector's scope to catch previously untracked test prefixes.

Key Changes

• Integration Test Refactoring (pubsub_integration_test.py, streaming_wordcount_it_test.py, streaming_wordcount_debugging_it_test.py):

• • Replaced manual and error-prone teardown logic (test_utils.cleanup_subscriptions and test_utils.cleanup_topics) with the TestPubsubContext monitor.
• • Explicitly registered temporary test topics and subscriptions (including ordering topics) to ensure guaranteed, graceful teardown on test completion.

• Stale Resource Cleaner Expansion (.test-infra/tools/stale_cleaner.py):

• • Appended missing test prefixes to the cleanup tracking list (e.g., wc_topic_*, psit_*, leader_board_*).
• • Ensures any orphaned resources that slip through the cracks during local or CI test failures are properly detected and deleted by the automated stale cleaner.

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.19%. Comparing base (9451007) to head (98a4019).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #39826      +/-   ##
============================================
+ Coverage     57.10%   57.19%   +0.08%     
  Complexity     3643     3643              
============================================
  Files          1191     1193       +2     
  Lines        192542   192979     +437     
  Branches       3816     3816              
============================================
+ Hits         109957   110378     +421     
- Misses        79027    79043      +16     
  Partials       3558     3558              

Flag	Coverage Δ
python	79.93% <ø> (+0.08%)	⬆️

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