R1:10f2cfec5b37

Maniphest - remove references to deprecated transaction type TYPE_PROJECTS from code

Summary:
...except the transaction class itself, which still needs some knowledge of these transactions for older installs.

Ref T5245. T5604 and T5245 are now in a similar place -- there's an unknown set of bugs introduced from my changes and there's still old display code lying around with some old transactions in the database. I'll stomp out the bugs if / when they surface and data migration is up next.

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