fix(stop-and-wait): handle call to runtime.Goexit() in task

[alitto]

Changes

• Ensure calls to runtime.Goexit() inside task functions doesn't cause the pool to hang later on when StopAndWait() is invoked.

Fixes #135

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.58%. Comparing base (505910b) to head (86e4ef6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
+ Coverage   95.54%   95.58%   +0.03%     
==========================================
  Files          11       11              
  Lines         584      589       +5     
==========================================
+ Hits          558      563       +5     
  Misses         23       23              
  Partials        3        3              

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