Add helper jobs for branch protection

[blink1073]

Makes it easier to maintain required checks for branch protection.

[codecov-commenter]

Codecov Report

Merging #797 (63e7778) into main (f7f49fa) will increase coverage by 0.08%.
The diff coverage is n/a.

❗ Current head 63e7778 differs from pull request most recent head f18adc2. Consider uploading reports for the commit f18adc2 to get more accurate results

@@            Coverage Diff             @@
##             main     #797      +/-   ##
==========================================
+ Coverage   69.88%   69.96%   +0.08%     
==========================================
  Files          62       62              
  Lines        7368     7368              
  Branches     1220     1223       +3     
==========================================
+ Hits         5149     5155       +6     
+ Misses       1844     1841       -3     
+ Partials      375      372       -3     

Impacted Files	Coverage Δ
jupyter_server/utils.py	61.38% <0.00%> (ø)
jupyter_server/serverapp.py	65.11% <0.00%> (+0.19%)	⬆️
jupyter_server/services/contents/filemanager.py	72.78% <0.00%> (+0.82%)	⬆️

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[blink1073]

@meeseeksdev please backport to 1.x