chore: ignore repeat files and add test

[TimothyMakkison]

Used the new IgnoreGeneratedResult to ignore PreserveAttribute and Generated files from the snapshot tests.

• Added ShouldEmitAllFiles snapshot test to verify that the generated files are still created.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.66%. Comparing base (6ebeda5) to head (c08e83c).
Report is 81 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1804      +/-   ##
==========================================
- Coverage   87.73%   83.66%   -4.08%     
==========================================
  Files          33       36       +3     
  Lines        2348     2442      +94     
  Branches      294      345      +51     
==========================================
- Hits         2060     2043      -17     
- Misses        208      316     +108     
- Partials       80       83       +3     

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.