[Infra] Avoid test flakiness

[martincostello]

Changes

Attempt to avoid flakiness in the TaskWorkerTests class example.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.78%. Comparing base (e0948d0) to head (86375b6).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7099      +/-   ##
==========================================
- Coverage   88.79%   88.78%   -0.02%     
==========================================
  Files         270      270              
  Lines       12928    12928              
==========================================
- Hits        11480    11478       -2     
- Misses       1448     1450       +2     

Flag	Coverage Δ
unittests-Project-Experimental	88.66% <ø> (-0.12%)	⬇️
unittests-Project-Stable	88.75% <ø> (+<0.01%)	⬆️

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see 2 files with indirect coverage changes

[Copilot]

Pull request overview

Reduces intermittent CI failures in TaskWorkerTests by adding extra timing tolerance to asynchronous waits and improving the failure message when a wait condition is not satisfied.

Changes:

• Added a small assert timeout tolerance and applied it to WaitUntilAsync calls in the affected tests.
• Improved WaitUntilAsync failure output to include the configured timeout.

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