fix: add invalid regex validation for commitConfig

[jescalada]

Fixes #1336.

Most of the changes are unit tests for the new code and /src/config/index.ts.

[netlify]

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Name	Link
🔨 Latest commit	056c086
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.78%. Comparing base (dd7d162) to head (056c086).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1355      +/-   ##
==========================================
+ Coverage   80.40%   80.78%   +0.37%     
==========================================
  Files          65       66       +1     
  Lines        4608     4673      +65     
  Branches      775      796      +21     
==========================================
+ Hits         3705     3775      +70     
+ Misses        888      883       -5     
  Partials       15       15              

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