Update BulkSearchControls.vue to use the new ChatGPT 4o mini

[benbdeitch]

Closes #9620

This PR switches our Bulk Search feature to use a cheaper ChatGPT model.

Technical

Testing

Go to /search/bulk, and try it out. You'll need to provide your own OpenAI API key.

Screenshot

Stakeholders

@cdrini

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.21%. Comparing base (ce16a79) to head (e19a972).
Report is 55 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9623      +/-   ##
==========================================
+ Coverage   16.06%   16.21%   +0.15%     
==========================================
  Files          90       90              
  Lines        4769     4786      +17     
  Branches      832      829       -3     
==========================================
+ Hits          766      776      +10     
- Misses       3480     3486       +6     
- Partials      523      524       +1     

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[cdrini]

Tested on testing, looking good!