R1:d70dd190e4e5

Make project profile picture edits transactional

Summary: Ref T4379. Make changing pictures use apptransactions.

Test Plan: {F111554}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4379

Differential Revision: https://secure.phabricator.com/D8184