chore(test): issue 3969

[rozzilla]

This relates to...

Fixes #3969

Rationale

The test was timing out intermittently when run under full suite pressure (npm run test:unit) because it relied on a fixed 500ms wall-clock sleep rather than synchronizing on actual async operations. The test was blindly hoping that the sleep time would settle all the internal state, but under stress pressure, that assumption breaks. Additionally, the RetryAgent was never explicitly closed, potentially causing resource leaks or stale state between tests in the suite.

Changes

• Remove await sleep(500) to eliminate the wall-clock wait that masked timing races
• Move agent instantiation before teardown to allow reference in the after() hook for proper cleanup
• Add await agent.close() in teardown to ensure RetryAgent resources are explicitly released

Features

N/A

Bug Fixes

N/A

Breaking Changes and Deprecations

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.92%. Comparing base (d3ea390) to head (7f52e29).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5005   +/-   ##
=======================================
  Coverage   92.92%   92.92%           
=======================================
  Files         110      110           
  Lines       35729    35735    +6     
=======================================
+ Hits        33201    33208    +7     
+ Misses       2528     2527    -1     

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[mcollina]

lgtm