Make transition_to a required argument on MaxGenParallelism

[mgarrard]

Summary: This is step 1 to making transition_to a required argument on TC. We'll make maxparallelism point to self, since it should stay on it's current node when met or unmet.

Differential Revision: D86066476

[meta-codesync[bot]]

@mgarrard has exported this pull request. If you are a Meta employee, you can view the originating Diff in D86066476.

[codecov-commenter]

Codecov Report

:x: Patch coverage is 97.46835% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 96.58%. Comparing base (503cc7b) to head (2aeae97).

Files with missing lines	Patch %	Lines
ax/generation_strategy/generation_strategy.py	88.23%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4507      +/-   ##
==========================================
- Coverage   96.58%   96.58%   -0.01%     
==========================================
  Files         546      546              
  Lines       56058    56019      -39     
==========================================
- Hits        54143    54104      -39     
  Misses       1915     1915              

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