Remove ReleephProject->repositoryID writes

Summary: Ref T3655. Depends on D6633. This removes the writes and the column.

Test Plan: Created a project, edited a project. Verified the table doesn't have any keys including this column.

Reviewers: btrahan

Reviewed By: btrahan

CC: LegNeato, aran

Maniphest Tasks: T3655

Differential Revision: https://secure.phabricator.com/D6634