* and stop setting default values in python operator code, so defaults can be set at the server side.

This issue is just for the PR and questions from maintainers. 
tests/providers/yandex/hooks/test_yandexcloud_dataproc.py
def _init_hook(self):
        with patch('airflow.hooks.base.BaseHook.get_connection') as get_connection_mock:
            get_connection_mock.return_value = self.connection
            self.hook = DataprocHook()
    def setUp(self):
        self.connection = Connection(extra=json.dumps({'extra__yandexcloud__oauth': OAUTH_TOKEN}))
        self._init_hook()
    @patch('yandexcloud.SDK.create_operation_and_get_result')
    def test_create_dataproc_cluster_mocked(self, create_operation_mock):
        self._init_hook()
        self.hook.client.create_cluster(
            cluster_name=CLUSTER_NAME,
            ssh_public_keys=SSH_PUBLIC_KEYS,
            folder_id=FOLDER_ID,
            subnet_id=SUBNET_ID,
            zone=AVAILABILITY_ZONE_ID,
            s3_bucket=S3_BUCKET_NAME_FOR_LOGS,
            cluster_image_version=CLUSTER_IMAGE_VERSION,
            service_account_id=SERVICE_ACCOUNT_ID,
        )
        assert create_operation_mock.called
    @patch('yandexcloud.SDK.create_operation_and_get_result')
    def test_delete_dataproc_cluster_mocked(self, create_operation_mock):