Update all instances of MinimumPreferenceOccurances to directly use T…

…ransitionCriterion (facebookresearch#327)

Summary:
X-link: facebook/Ax#2135


We have replaced the more limited MinimumTrialsInStatus with the more flexible TransitionCriterion MinTrials. This diff updates MinimumPreferenceOccurances to directly inherit from its source in TransitionCriterion file

In following diffs we will:
- Completely remove the completion criterion file
- update all four completion criterion defined in aepsych code here: https://www.internalfb.com/code/fbsource/[409e3dfb01ec5c613d34e58c491d63e8051d10d9]/fbcode/frl/ae/aepsych/tests/generators/test_completion_criteria.py?lines=12-15
- revisit storage
- remove all todos in gennode, genstrat, and transitioncriterion classes related to maintaining this deprecated code
- update AEPsych GSs as needed
- determine if run indefinetly can be replaced by simply having gen_unlimited_trials = true

Additional info: https://docs.google.com/document/d/1JWaD20ux8dRVWom3VhTBkh4_1v170XNJ3Xf7EdWsMc8/edit?usp=sharing

Differential Revision: D52852317

aepsych/generators/completion_criterion/min_total_outcome_occurrences.py

@@ -9,7 +9,7 @@
 
 from aepsych.config import Config, ConfigurableMixin
 
-from ax.modelbridge.completion_criterion import MinimumPreferenceOccurances
+from ax.modelbridge.transition_criterion import MinimumPreferenceOccurances
 
 
 class MinTotalOutcomeOccurrences(MinimumPreferenceOccurances, ConfigurableMixin):