ci: remove untrusted gha workflow

[scotthart]

With all the GHA builds disabled, there's no need to keep this around.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (95a7914) to head (d19b161).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15861      +/-   ##
==========================================
- Coverage   92.95%   92.94%   -0.01%     
==========================================
  Files        2458     2458              
  Lines      227590   227590              
==========================================
- Hits       211548   211542       -6     
- Misses      16042    16048       +6     

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