R1:296bf046a812

Remove deprecated Maniphest "Can Edit <Specific Property>" capabilities

Summary:
Depends on D19579. Fixes T10003. These have been deprecated with a setup warning about their impending removal for about two and a half years.

Ref T13164. See PHI642. My overall goal here is to simplify how we handle transactions which have special policy behaviors. In particular, I'm hoping to replace `ApplicationTransactionEditor->requireCapabilities()` with a new, more clear policy check.

A problem with…