Changes to Get open-registration groups, group types, and ancestor groups by org. Roles: public.

added the optional property groups/items/groupType/externalReferenceId to the response with the 200 status

added the optional property error/errorId to the response with the 400 status

added the optional property error/errorId to the response with the 401 status

added the optional property error/errorId to the response with the 403 status

added the optional property error/errorId to the response with the 404 status

added the optional property error/errorId to the response with the 500 status