prod: do not run model tests on PRs

[beckermr]

Description:

This is consuming CI resources in a way that is not needed. Once a day is enough and we are not using the models heavily anyways.

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.58%. Comparing base (683b996) to head (e7025ff).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5859      +/-   ##
==========================================
- Coverage   80.64%   80.58%   -0.07%     
==========================================
  Files         146      146              
  Lines       17393    17393              
==========================================
- Hits        14027    14016      -11     
- Misses       3366     3377      +11     

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