Related Discovery: https://openedx.atlassian.net/wiki/spaces/OEPM/pages/6060310529/Spike+-+M2+-+Endpoints+for+new+Admin+Console+designs
Modify the existing role assignment endpoint to sipport more than one scope at a time (bulk assign).
Spec:
PUT /api/authz/v1/roles/users/
- This endpoint already exists, but it only supports one scope at a time. We will need to add support for more than one scope at a time, but keep backwards compatibility.