Finished migration from setup.cfg to pyproject.toml

[jamesbraza]

Most of the configs in setup.cfg were all unused/stale as of #1323 almost a year ago -- replaced with ruff. So this PR:

• Migrates pytest config to pyproject.toml
• Removes mostly unused setup.cfg
• Removes old flake8: noqa comment in favor of ruff: noqa

[HuggingFaceDocBuilderDev]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a27cce6) 82.22% compared to head (2d664c3) 82.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1971      +/-   ##
==========================================
+ Coverage   82.22%   82.49%   +0.27%     
==========================================
  Files          66       66              
  Lines        8147     8147              
==========================================
+ Hits         6699     6721      +22     
+ Misses       1448     1426      -22     

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[Wauplin]

Thanks a lot for cleaning this up @jamesbraza! Changes looks good to me :)
We kept stale config for isort/flake for contributors to slowly moved out from them in favor of ruff. But should be good by now 😄