Remove xml_missing() tests

[IndrajeetPatil]

Closes #2359

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8029e1f) 98.68% compared to head (d824379) 98.64%.

❗ Current head d824379 differs from pull request most recent head 6fb1d51. Consider uploading reports for the commit 6fb1d51 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2397      +/-   ##
==========================================
- Coverage   98.68%   98.64%   -0.04%     
==========================================
  Files         126      126              
  Lines        5700     5610      -90     
==========================================
- Hits         5625     5534      -91     
- Misses         75       76       +1     

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[AshesITR]

The test should instead be refactored to honor is_linter_level(), I think.

[MichaelChirico]

I'll let @AshesITR give review here, thanks for the clean-up!

[AshesITR]

@IndrajeetPatil PTAL. I restored the test to a working one and removed the extra newlines left in the diff

[IndrajeetPatil]

Thanks, @AshesITR, for taking this to the finish line. I've made one minor change.

[MichaelChirico]

This is beautiful 🥹