rename gen_for_multiple_trials_with_mulitple_nodes to gen

[mgarrard]

Summary: We want the most powerful gen to be our default gen, and that's gen_for_multi_with_multi, in the previous diff we free'd up the name gen

Differential Revision: D75718755

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D75718755

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.87%. Comparing base (82583c3) to head (423c266).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3846   +/-   ##
=======================================
  Coverage   95.87%   95.87%           
=======================================
  Files         557      557           
  Lines       55021    55021           
=======================================
  Hits        52751    52751           
  Misses       2270     2270           

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D75718755

[facebook-github-bot]

This pull request has been merged in facebook/Ax@ed722e9631a2d2d39cc403f317db11de2b56ba13.