Use ApplicationTransactions for Releeph product activity

Summary:
Ref T3549. Ref T3663.

  - Use transactions for activate/deactivate.
  - Rename some "project" -> "product".

Test Plan:
  - Activated products.
  - Deactivated products.

{F135480}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T3663, T3549

Differential Revision: https://secure.phabricator.com/D8634