fix(dispatcher): ensure workers exit reliably when worker count is low

[alitto]

This pull request includes changes to the .github/workflows/main.yml and pool.go files to enhance compatibility and improve the worker management logic. The most important changes include adding Windows OS to the CI workflow and refactoring the worker management logic to simplify the code and avoid potential deadlocks.

CI Workflow Enhancements:

• .github/workflows/main.yml: Added windows-latest to the list of operating systems in the matrix strategy to ensure compatibility across more environments.

Worker Management Refactoring:

• pool.go: Introduced NUM_CPU variable to store the number of CPUs and used it to define MAX_TASKS_CHAN_LENGTH.
• pool.go: Simplified the startWorker function by removing the canExitDuringDispatch parameter and updating the worker function call accordingly.
• pool.go: Refactored the workerCanExit function to remove the canExitDuringDispatch parameter and added a check to allow worker exit if the number of workers exceeds the number of CPUs.
• pool.go: Updated the worker function to call the refactored workerCanExit function without the canExitDuringDispatch parameter.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.52%. Comparing base (9f8d16a) to head (1d93c12).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
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  Coverage   95.52%   95.52%           
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  Files          14       14           
  Lines         849      849           
=======================================
  Hits          811      811           
  Misses         34       34           
  Partials        4        4           

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