refactor(check): rename variable and compile pattern once

[bearomorphism]

Description

Checklist

• I have read the contributing guidelines

Code Changes

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and tests
• Manually test the changes:
  • Verify the feature/bug fix works as expected in real-world scenarios
  • Test edge cases and error conditions
  • Ensure backward compatibility is maintained
  • Document any manual testing steps performed
• Update the documentation for the changes

Expected Behavior

Steps to Test This Pull Request

Run cz check --message "<random strings>" to check if the error message works like before.

Additional Context

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.82%. Comparing base (59fd3f5) to head (7a5dfb9).

Additional details and impacted files

@@            Coverage Diff             @@
##           refactors    #1470   +/-   ##
==========================================
  Coverage      97.82%   97.82%           
==========================================
  Files             57       57           
  Lines           2619     2619           
==========================================
  Hits            2562     2562           
  Misses            57       57           

Flag	Coverage Δ
unittests	97.82% <100.00%> (ø)

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[Lee-W]

I'm somewhat worried about this one. I guess there might been users actually use the message to check. Probably could make it a deprecated thing and change in v5

[bearomorphism]

I'm somewhat worried about this one. I guess there might been users actually use the message to check. Probably could make it a deprecated thing and change in v5

Then let me revert the capitalized part of this PR.

[bearomorphism]

I'm somewhat worried about this one. I guess there might been users actually use the message to check. Probably could make it a deprecated thing and change in v5

Fixed. You meant the error message, right?