owncloud/core

Enhancement: Prevent group assignment in Web UI if not supported

This enhancement checks if users can be assigned to (or removed from)
groups via Web UI. All group backends which do not support this
functionality will be disabled in corresponding menus.

https://github.com/owncloud/core/pull/38298
https://github.com/owncloud/guests/issues/431
https://github.com/owncloud/core/issues/38580