R1:83db5965ab6c

Maniphest - introduce needProjectPHIDs

Summary: Ref T5245. This is some of the associated cleanup there.

Test Plan:
foreach ManiphestTaskQuery site, I made the change (or not) and tested as follows:

=== Call sites where added needProjectPHIDs ===

- PhabricatorHomeMainController - loaded the home page
- ManiphestBatchEditController - batch edited some tasks (added a project)
- ManiphestConduitAPIMethod - tested implicitly when tested ManiphestUpdateConduitAPIMethod
- ManiphestInfoConduitAPIMethod - used…