Clean up handling of draft release metadata

[blink1073]

Fixes #384

Also adds logging for the values, to help diagnosing things like #385

[codecov-commenter]

Codecov Report

Base: 82.40% // Head: 82.51% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (c0093c0) compared to base (7436386).
Patch coverage: 72.22% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #387      +/-   ##
==========================================
+ Coverage   82.40%   82.51%   +0.10%     
==========================================
  Files          21       21              
  Lines        2899     2899              
  Branches      384      380       -4     
==========================================
+ Hits         2389     2392       +3     
- Misses        371      373       +2     
+ Partials      139      134       -5     

Impacted Files	Coverage Δ
jupyter_releaser/cli.py	89.86% <71.42%> (-1.05%)	⬇️
jupyter_releaser/util.py	71.42% <75.00%> (+0.94%)	⬆️

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