Clean up workflows

[blink1073]

• Consolidate into a single python-tests workflow
• Add pytest args used by ipython CI

Now that we can restart individual jobs, it makes sense to consolidate these workflows

[codecov-commenter]

Codecov Report

Merging #747 (c05df5e) into main (619fd23) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head c05df5e differs from pull request most recent head 50ca7cf. Consider uploading reports for the commit 50ca7cf to get more accurate results

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
- Coverage   70.72%   70.68%   -0.04%     
==========================================
  Files          62       62              
  Lines        7615     7615              
  Branches     1216     1216              
==========================================
- Hits         5386     5383       -3     
- Misses       1856     1858       +2     
- Partials      373      374       +1     

Impacted Files	Coverage Δ
jupyter_server/base/zmqhandlers.py	55.55% <0.00%> (-1.59%)	⬇️

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