Changes to patchBulkJob

the request property task_token became optional

added the new RESTART enum value to the request property action

added the optional property execution_stats to the response with the 200 status

added the optional property execution_summary_truncated to the response with the 200 status

added the optional property last_error to the response with the 200 status

added the optional property restart_count to the response with the 200 status

added the optional property restarted_at to the response with the 200 status