More workflow cleanup

[blink1073]

• Fix capture of default branch
• Allow branch to be specified in addition to repo/owner
• Do not show pre-commit automated PRs in changelog
• Render "Since Last Stable" with a checkbox
• Add more logging

[codecov-commenter]

Codecov Report

Base: 82.58% // Head: 82.40% // Decreases project coverage by -0.17% ⚠️

Coverage data is based on head (b4ebf7e) compared to base (e8dd7b6).
Patch coverage: 42.85% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
- Coverage   82.58%   82.40%   -0.18%     
==========================================
  Files          21       21              
  Lines        2888     2899      +11     
  Branches      382      384       +2     
==========================================
+ Hits         2385     2389       +4     
- Misses        364      371       +7     
  Partials      139      139              

Impacted Files	Coverage Δ
jupyter_releaser/actions/draft_changelog.py	0.00% <0.00%> (ø)
jupyter_releaser/util.py	70.48% <80.00%> (-0.03%)	⬇️
jupyter_releaser/changelog.py	84.39% <100.00%> (+0.22%)	⬆️

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