chore(ci): Add custom script for test summary

[philprime]

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.563%. Comparing base (e9dfabe) to head (78f1bc3).
Report is 7 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4671       +/-   ##
=============================================
- Coverage   90.641%   90.563%   -0.078%     
=============================================
  Files          621       620        -1     
  Lines        71152     70830      -322     
  Branches     25315     25657      +342     
=============================================
- Hits         64493     64146      -347     
- Misses        6567      6591       +24     
- Partials        92        93        +1     

see 81 files with indirect coverage changes

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[philipphofmann]

I'm not sure if we should add a large script for this use case; see #4653 (comment).