R1:8c84ed61b1e6

Migrate project profiles onto projects, and remove ProjectProfile object

Summary:
Ref T4379. Long ago, the "Project" vs "ProjectProfile" split was intended to allow a bunch of special fields on projects without burdening the simple use cases, but CustomField handles that far better and far more generally, and doing this makes using ApplicationTransactions a pain to get right, so get rid of it.

The only remaining field is `profileImagePHID`, which we can just move to the main Project object. This is…