CI: don't trigger tests for "on push" if changes only in docs folder or markdown files; move devops_tests and pre-commit jobs to a separate workflow

[AgnieszkaZaba]

As in GitHub-actions documentation.

[slayoo]

@AgnieszkaZaba , thanks!
we should then move precommit and devops jobs to another file since these two (which will anyhow be merged into one soon) do check contents of the docs folder as well

[AgnieszkaZaba]

And we should add README.md file to be ignored as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.53%. Comparing base (3bb71c1) to head (b165b8a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1635   +/-   ##
=======================================
  Coverage   85.53%   85.53%           
=======================================
  Files         396      396           
  Lines        9601     9601           
=======================================
  Hits         8212     8212           
  Misses       1389     1389           

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[slayoo]

thanks @AgnieszkaZaba !