fix(git-node): promoting a release using only PR number

[aduh95]

Using the full URL should be preferred as that's the path to the least surprise, but passing only PR number should not error.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.71%. Comparing base (d6ab4fc) to head (b4cb0b7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1028   +/-   ##
=======================================
  Coverage   80.71%   80.71%           
=======================================
  Files          39       39           
  Lines        4754     4754           
=======================================
  Hits         3837     3837           
  Misses        917      917           

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