Changes to Read an operator's avatar

the response property error/details became required for the status 429

the response property error/details became required for the status 503

the response property meta became required for the status 429

the response property meta became required for the status 503

the response property meta/api_version became required for the status 429

the response property meta/api_version became required for the status 503

added the required property meta/request_id to the response with the 429 status

added the required property meta/request_id to the response with the 503 status

the response property error/details became nullable for the status 429

the response property error/details became nullable for the status 503

added the non-success response with the status 503

endpoint added