fix(test): raise spawn-child join timeout in test_multi_process_visibility (main)

[erichare]

Forward-port of #13588 to main (clean cherry-pick of 443f1fd). See #13588 for details: the spawn-context child needs to cold-import the full langflow package and 10s is routinely exceeded on loaded CI runners; raised to 60s + kill-on-timeout.

Summary by CodeRabbit

• Tests
  • Improved robustness of multi-process event appending test with enhanced timeout handling and cleanup procedures.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3fc644f and 916b88c.

📒 Files selected for processing (1)

• src/backend/tests/unit/test_flow_events_service.py

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Walkthrough

Updated test_multi_process_visibility to improve robustness of multi-process event appending by extending the child process join timeout and adding a forced termination fallback that kills the process if it exceeds the timeout, then rejoins to ensure cleanup completes.

Changes

Test Process Cleanup Robustness

Layer / File(s)	Summary
Multi-process visibility test timeout and cleanup src/backend/tests/unit/test_flow_events_service.py	Extended join timeout for spawned process and added forced termination with kill fallback to ensure cleanup completes reliably instead of hanging.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

ignore-for-release

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/multiprocess-test-spawn-timeout-main

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[github-actions]

✅ Test Coverage Advisor

No source changes detected without accompanying tests. Thanks for keeping coverage up! 🎉

Advisory check only — never blocks merge.