Detached the requested custom Project Policy from the Project.
The specified ProjectPolicy will no longer be applied to all Project members,
unless attached to them individually or through their group membership.

The ProjectPolicy is still available to attach to individual members.

Access Control:

• The calling principal must have both "manageMembers" and "managePolicies" action permissions for the resource "{project}" in the "authorization" service.
• In the Project workflow, the above permission is granted to all Project Admins and Resource Managers.
• The calling principal MUST NOT include a project scope.