Use pytest-xdist

[blink1073]

Speed up CI by running tests in parallel.
Also disable bytecode generation in CI.

[codecov-commenter]

Codecov Report

Base: 73.10% // Head: 72.98% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (ecfd79d) compared to base (213e25c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1032      +/-   ##
==========================================
- Coverage   73.10%   72.98%   -0.13%     
==========================================
  Files          64       64              
  Lines        8274     8274              
  Branches     1643     1640       -3     
==========================================
- Hits         6049     6039      -10     
- Misses       1816     1822       +6     
- Partials      409      413       +4     

Impacted Files	Coverage Δ
jupyter_server/services/contents/filemanager.py	70.05% <0.00%> (-1.57%)	⬇️
jupyter_server/base/zmqhandlers.py	53.12% <0.00%> (-0.53%)	⬇️
jupyter_server/serverapp.py	66.21% <0.00%> (-0.09%)	⬇️

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[blink1073]

I'll put this back in draft pending #1035 to make sure there is no interference.

[blink1073]

This seems to be too disruptive, closing.