Refactor and Simplify Workflows

[blink1073]

More progress toward #272

[codecov-commenter]

Codecov Report

Merging #363 (0f6ca9f) into main (519b8dd) will increase coverage by 4.54%.
The diff coverage is 73.70%.

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
+ Coverage   78.39%   82.93%   +4.54%     
==========================================
  Files          21       21              
  Lines        2721     2866     +145     
  Branches      355      374      +19     
==========================================
+ Hits         2133     2377     +244     
+ Misses        469      356     -113     
- Partials      119      133      +14     

Impacted Files	Coverage Δ
jupyter_releaser/actions/common.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/draft_changelog.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/draft_release.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/publish_release.py	0.00% <0.00%> (ø)
jupyter_releaser/mock_github.py	64.11% <45.28%> (+64.11%)	⬆️
jupyter_releaser/util.py	71.98% <69.47%> (-1.11%)	⬇️
jupyter_releaser/lib.py	80.82% <73.68%> (-0.52%)	⬇️
jupyter_releaser/cli.py	90.90% <100.00%> (+0.09%)	⬆️
jupyter_releaser/python.py	72.72% <100.00%> (ø)
jupyter_releaser/tests/conftest.py	98.74% <100.00%> (+0.18%)	⬆️
... and 6 more

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