Update target trial selection logic to only consider trials with data for optimization config metrics

[mgarrard]

Summary:
This updates target trial selection logic in the following ways:

1. We only consider trials that either (a) have data for all opt config metrics or (b) have data for all metrics -- previously if a trial had data for some opt config metrics it passed the check, but this partial data setup causes issues downstream
2. If there is no long run trial, we fallback to short run instead of not identifying a target trial
3. filters out "stale" trials, ie trials that were completed over 10 days ago -- hitting this point would be pretty far down our priority list, but was an idea ItsMrLin initially had that i thought was really interesting
4. lastly if no trials exist after stale is filtered out, use the stale ones anyway (necessary for benchmarking)
5. if we still can't find anything, it will return none

Differential Revision:
D90089411

Privacy Context Container: L1307644

[meta-codesync]

@mgarrard has exported this pull request. If you are a Meta employee, you can view the originating Diff in D90089411.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.72%. Comparing base (aa29dd8) to head (65a540f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4742      +/-   ##
==========================================
- Coverage   96.72%   96.72%   -0.01%     
==========================================
  Files         582      582              
  Lines       60693    60745      +52     
==========================================
+ Hits        58708    58757      +49     
- Misses       1985     1988       +3     

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