fix(pool): ensure pool recovers after runtime.Goexit()

[alitto]

Changes

• Ensure the pool recovers after one of the tasks kills one of the worker goroutines via runtime.Goexit(). A new worker is launched if there are tasks left in the queue and metrics are updated to account for the failed task.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.63%. Comparing base (642bffa) to head (cba21c1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
+ Coverage   95.58%   95.63%   +0.04%     
==========================================
  Files          11       11              
  Lines         589      595       +6     
==========================================
+ Hits          563      569       +6     
  Misses         23       23              
  Partials        3        3              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.