R1:212b0d29c54f

Add an acceptance test for Celerity maps

Summary: Fixes T5374. Add an acceptance test to the `PhabricatorInfrastructureTestCase` class which fails if a Celerity map is not up-to-date. In order to achieve this, a lot of code used to generate Celerity maps was transferred from `CelerityManagementMapWorkflow` to `CelerityResourceMap` and `CelerityResourceMapGenerator`.

Test Plan: Ran `arc unit` and noticed that all tests passed. Modified a JavaScript file and ran `arc unit` again (without running `.