Same as T142120: Remove UnitTestsList hook subscribers, move tests to be autodiscovered for extensions that have been converted to extension registration, just more specifically for WMF extensions.
Current list as currently in 1.31.0-wmf.10:
- BounceHandler: https://gerrit.wikimedia.org/r/#/c/313654/
- CentralNotice: https://gerrit.wikimedia.org/r/#/c/303261/
- DonationInterface https://gerrit.wikimedia.org/r/#/c/428059/
- FlaggedRevs (blocked by T87915: Convert FlaggedRevs to use extension registration)
- OAuth: https://gerrit.wikimedia.org/r/#/c/313653/
- PagedTiffHandler: https://gerrit.wikimedia.org/r/#/c/427715/
- TimedMediaHandler (blocked by T87981: Convert TimedMediaHandler to use extension registration)
- Wikidata