chore: optimize the Conventional Commit Linter workflow

[aduh95]

We never need to fetch 100 commits, and we only care about the commit messages so we can use sparse-checkout

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.98%. Comparing base (19b468a) to head (8fa3453).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1031   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          39       39           
  Lines        4823     4823           
=======================================
  Hits         3906     3906           
  Misses        917      917           

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