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 the method via conduit console with input id : 1
- ManiphestQueryConduitAPIMethod - used the method via conduit console with input ids : [1, 2]
- ManiphestUpdateConduitAPIMethod - used the method via conduit with input id : 1 and comment : “asdasds"
- ManiphestReportController - viewed “By User” and “By Project”
- ManiphestSubpriorityController - changed the priority of a task via a drag on manphest home
- ManiphestTaskMailReceiver - updated Task 1 via bin/mail receive-test with a comment that is the README
- ManiphestTaskSearchEngine - loaded Manifest home page
- ManiphestTaskEditController - edited a task
- ManiphestTransactionEditor - closed a blocking task
- ManiphestTransactionSaveController - commented on a task
- PhabricatorProjectProfileController - viewed project with id of 1 that has a few tasks in it
- PhabricatorSearchAttachController - merged tasks together
- DifferentialTransactionEditor - submit a diff that references a task; commit the diff (thus closing the diff) and the task gets updated
- PhabricatorRepositoryCommitMessageParserWorker - submit a diff that references a task; commit the diff (thus closing the diff) and the task gets updated

=== Calls sites where *did not* add needProjectPHIDs (they do not appear in this revision) ===

- PhabricatorManiphestApplication - loaded the home page
- ManiphestGetTaskTransactionsConduitAPIMethod - used the method via conduit console with input ids : [1, 2] ManiphestTaskDetailController - viewed a task with and without associated projects; finished workflow creating a task with a parent
- ManiphestTransactionPreviewController - verified transaction preview showed up properly
- PhabricatorProjectBoardViewController - viewed a board
- PhabricatorProjectMoveController - moved a task around
- ManiphestRemarkupRule - made a task reference like {T123}
- ManiphestTaskQuery - executed a custom query for all tasks with page size of 2 and paginated through some tasks
- ManiphestTaskPHIDType - nothing random seems broken? =D

=== Call sites where had to do something funky ===

- ManiphestHovercardEventListener - loaded hover cards from task mentions

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T5245

Differential Revision: https://secure.phabricator.com/D11004