authorizers - remove federalist users admin

[amirbey]

User Story

Background (Optional)

Federalist users admin must be refactored to be in the pages-admin group. For example, serializers. It is possible that federalist users admin is removed altogether due to the existence of the admin interface.

Acceptance Criteria

• [ ] federalist-users admins can no longer access sites without site repo write access
• [ ] Change made live via Federalist

After evaluating, edit this part:

Level of effort - Low

Implementation outline (if higher than "low" effort):

• [ ] remove federalist-users-admin permissions from authorizers