Summary: This capability controls which users are allowed to create rooms. By default anyone is allowed to do so, similar to how it was before. Closes T16021 Test Plan: * Change the policy for room creation in Conpherence to Administrators * Sign-in with a non administrator * Go to conpherence and see that "Create a Room" is greyed out * Click on "Create a Room" and see an error message warning about insufficient permissions Reviewers: O1 Blessed Committers, avivey Reviewed By: O1 Blessed Committers, avivey Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T16021 Differential Revision: https://we.phorge.it/D26375