--parallel execution limits

[mr-c]

• parallel execution: respect the CPUs main available to us
• --parallel-max: control the amount of parallel execution

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.12%. Comparing base (011c3dd) to head (1e29cd2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2189      +/-   ##
==========================================
+ Coverage   85.11%   85.12%   +0.01%     
==========================================
  Files          46       46              
  Lines        8405     8412       +7     
  Branches     1967     1968       +1     
==========================================
+ Hits         7154     7161       +7     
  Misses        784      784              
  Partials      467      467              

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