test: enhance test files with structured comments and file overviews

[lumirlumir]

This pull request adds file overview comments and organizes test files for better readability across multiple packages. The changes primarily include adding documentation comments and structuring sections within the test files.

Documentation and structure improvements:

• Added file overview comments to test files in packages/clang-format-git-python/src (cli.test.js, index.test.js, utils/gitClangFormatPath.test.js). [1] [2] [3]
• Added file overview comments to test files in packages/clang-format-git/src (cli.test.js, index.test.js, utils/getGitClangFormatPath.test.js, utils/gitClangFormatPath.test.js). [1] [2] [3] [4]
• Added file overview comments to test files in packages/clang-format-node/src (cli.test.js, index.test.js, utils/clangFormatPath.test.js, utils/getClangFormatPath.test.js). [1] [2] [3] [4]

Structural organization:

• Added sections for "Require", "Declaration", and "Test" within test files to improve readability and organization. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

[github-actions]

Labels have been automatically applied based on the conventional commit types.🏷️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (209f1cf) to head (1c9e967).
Report is 1 commits behind head on main.

@@            Coverage Diff            @@
##              main      #143   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines           61        61           
=========================================
  Hits            61        61           

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