Generate expected Project schemata

Summary:
Ref T1191. Notes:

  - Drops the project affiliation table. This is a very old membership table which was migrated to edges.
  - Drops the subproject table. This is a very old table for a removed feature.

Test Plan:
  - Grepped for dropped tables.
  - Saw ~100 fewer setup issues.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1191

Differential Revision: https://secure.phabricator.com/D10581