Trigger and skip trufflehog scan in merge group

[pstjohn]

This is a required check, but isn't really needed and doesn't seem to work properly in a merge queue. Here we skip the scan if we're in a merge queue

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.16%. Comparing base (588fb75) to head (e66e021).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #728      +/-   ##
==========================================
- Coverage   85.93%   84.16%   -1.78%     
==========================================
  Files         120      128       +8     
  Lines        7310     8020     +710     
==========================================
+ Hits         6282     6750     +468     
- Misses       1028     1270     +242     

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