Support ScalarizedOutcomeConstraint in _prepare_p_feasible

[mgrange1998]

Summary:
Implementing support for ScalarizedOutcomeConstraint in _prepare_p_feasible and _prepare_p_feasible_per_constraint as specified in the the task T235432214

1. Modified _prepare_p_feasible (lines 621-642): Replaced the old oc_names loop with direct handling that uses _get_scalarized_constraint_mean_and_sem for ScalarizedOutcomeConstraint instances. This removes the TODO comment for T235432214

2. Modified _prepare_p_feasible_per_constraint (lines 706-749): Applied the same pattern to properly compute mean/sigma for scalarized constraints using the helper function.

Differential Revision: D92185974

[meta-codesync]

@mgrange1998 has exported this pull request. If you are a Meta employee, you can view the originating Diff in D92185974.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.33333% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.75%. Comparing base (56711df) to head (c44bcb6).

Files with missing lines	Patch %	Lines
ax/analysis/utils.py	88.63%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4856      +/-   ##
==========================================
- Coverage   96.76%   96.75%   -0.01%     
==========================================
  Files         589      589              
  Lines       61832    61881      +49     
==========================================
+ Hits        59830    59876      +46     
- Misses       2002     2005       +3     

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