Fix workflows and add new ones

[fcollonval]

This fixes most CodeQL advices

[codecov-commenter]

Codecov Report

Base: 65.20% // Head: 65.17% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (0103dd7) compared to base (f63822f).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   65.20%   65.17%   -0.04%     
==========================================
  Files          22       22              
  Lines        1739     1743       +4     
  Branches      274      290      +16     
==========================================
+ Hits         1134     1136       +2     
- Misses        521      523       +2     
  Partials       84       84              

Impacted Files	Coverage Δ
jupyterlab_server/__init__.py	90.90% <ø> (ø)
jupyterlab_server/licenses_handler.py	98.41% <0.00%> (-0.79%)	⬇️
jupyterlab_server/process.py	0.00% <0.00%> (ø)
jupyterlab_server/settings_utils.py	78.50% <ø> (-0.10%)	⬇️
jupyterlab_server/test_utils.py	63.15% <0.00%> (-0.68%)	⬇️
jupyterlab_server/translation_utils.py	69.11% <ø> (+0.77%)	⬆️
jupyterlab_server/listings_handler.py	48.78% <0.00%> (+1.28%)	⬆️

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