Changes to List assignable workspace roles

removed the media type text/plain for the response with the status 403

removed the media type text/plain for the response with the status 404

removed the media type text/plain for the response with the status 429

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 403

added the media type application/json for the response with the status 404

added the media type application/json for the response with the status 429

removed the media type application/json for the response with the status 401

removed the media type application/json for the response with the status 403

removed the media type application/json for the response with the status 404

added the media type text/plain for the response with the status 403

added the media type text/plain for the response with the status 404

added the non-success response with the status 429

removed the media type text/plain for the response with the status 403

removed the media type text/plain for the response with the status 404

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 403

added the media type application/json for the response with the status 404

endpoint added