fix: add sleep after HTTP server stop in health check test to avoid race condition

[josecelano]

The test it_should_return_error_when_http_service_was_stopped_after_registration was flaky on nightly Rust because the OS can keep a TCP port in CLOSE_WAIT/TIME_WAIT briefly after the server stops, causing the health check to still return Ok instead of Error.\n\nAdds a 100ms sleep after stop().await to let the OS fully release the TCP port before the health check runs.

[josecelano]

ACK de47145

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.47%. Comparing base (194f039) to head (de47145).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1662   +/-   ##
========================================
  Coverage    86.47%   86.47%           
========================================
  Files          288      288           
  Lines        22672    22672           
  Branches     22672    22672           
========================================
  Hits         19605    19605           
  Misses        2839     2839           
  Partials       228      228           

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