Assign pull-requests via CODEOWNERS

[olegbespalov]

What?

This changes the pull-request assignment from an in-house script/workflow to a CODEOWNERS file. The issues remain with the script/workflow since, at the moment of the change, CODEOWNERS still needs to support the issues balancing/assignment.

Why?

CODEOWNERS is more maintainable and provides other excellent features, like considering "busy" status.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bfdc446) 73.21% compared to head (11de1cc) 73.21%.

❗ Current head 11de1cc differs from pull request most recent head 8a88695. Consider uploading reports for the commit 8a88695 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3489   +/-   ##
=======================================
  Coverage   73.21%   73.21%           
=======================================
  Files         267      267           
  Lines       20083    20083           
=======================================
  Hits        14704    14704           
  Misses       4465     4465           
  Partials      914      914           

Flag	Coverage Δ
ubuntu	73.15% <ø> (-0.01%)	⬇️
windows	73.06% <ø> (-0.01%)	⬇️

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