Deprecate nearly all internal SQA classes (now that legacy PTS is reaped)

[lena-kashtelyan]

Summary:
Still figuring out if this is entirely safe, but I think we can lose most of our internal-only SQA classes, because they were meant to accommodate analysis run and scheduler, which we no longer have (now that we deprecated legacy PTS)! Woohoo!

Curious what folks think : )

Differential Revision: D80175881

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This pull request was exported from Phabricator. Differential Revision: D80175881

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@lena-kashtelyan has exported this pull request. If you are a Meta employee, you can view the originating diff in D80175881.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.29%. Comparing base (2336bb6) to head (3c8e20d).

Files with missing lines	Patch %	Lines
ax/storage/sqa_store/encoder.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4200   +/-   ##
=======================================
  Coverage   96.28%   96.29%           
=======================================
  Files         568      568           
  Lines       57922    57926    +4     
=======================================
+ Hits        55772    55780    +8     
+ Misses       2150     2146    -4     

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@lena-kashtelyan has exported this pull request. If you are a Meta employee, you can view the originating diff in D80175881.

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@lena-kashtelyan has exported this pull request. If you are a Meta employee, you can view the originating diff in D80175881.

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This pull request has been merged in 6f0df4a.