Add parallel testing to GitHub action phpunit

[korridor]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.25%. Comparing base (c07c62b) to head (3c61303).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #187      +/-   ##
============================================
- Coverage     89.27%   89.25%   -0.03%     
  Complexity     2028     2028              
============================================
  Files           282      282              
  Lines          9921     9921              
============================================
- Hits           8857     8855       -2     
- Misses         1064     1066       +2     

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[CLAassistant]

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