Mock out ax_parameter_sens in online/offline tests

[mpolson64]

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Summary: Should be safe since ax_parameter_sens is tested elsewhere.

These tests try and call compute() using over 100 different experiments, making each test very expensive -- this doubled our OSS unit testing time. With these changes the tests go from taking ~300s to ~50s on my machine in dev mode.

Differential Revision: D73066856

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D73066856

[codecov-commenter]

Codecov Report

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

Project coverage is 96.08%. Comparing base (82c553a) to head (8750265).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3648   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files         550      550           
  Lines       54368    54371    +3     
=======================================
+ Hits        52241    52244    +3     
  Misses       2127     2127           

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