ActorMigration is no longer required for the following fields:
They have been fully migrated to the actor table, so callers can just join on the actor table directly.
There are aliases in several getQueryInfo() calls which make them appear to exist, at least for the purposes of result fields. I think removing those aliases is going in the "too hard" basket for now. But removing the ActorMigration calls in core and hard-deprecating the use of ActorMigration for these fields is apparently feasible.