* 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/operators/test_yandexcloud_dataproc.py
computenode_disk_type='network-ssd',
            computenode_resource_preset='s2.small',
            datanode_count=2,
            datanode_disk_size=15,
            datanode_disk_type='network-ssd',
            datanode_resource_preset='s2.small',
            folder_id='my_folder_id',
            masternode_disk_size=15,
            masternode_disk_type='network-ssd',
            masternode_resource_preset='s2.small',
            s3_bucket='my_bucket_name',
            service_account_id=None,
            services=('HDFS', 'YARN', 'MAPREDUCE', 'HIVE', 'SPARK'),
            ssh_public_keys=[
                'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAYQCxO38tKAJXIs9ivPxt7AYdfybgtAR1ow3Qkb9GPQ6wkFHQqcFD'
                'e6faKCxH6iDRteo4D8L8BxwzN42uZSB0nfmjkIxFTcEU3mFSXEbWByg78aoddMrAAjatyrhH1pON6P0='
            ],
            subnet_id='my_subnet_id',
            zone='ru-central1-c',
        )
        context['task_instance'].xcom_push.assert_has_calls(
            [
                call(key='cluster_id', value=create_cluster_mock().response.id),
                call(key='yandexcloud_connection_id', value=CONNECTION_ID),
            ]
        )
    @patch('airflow.providers.yandex.hooks.yandex.YandexCloudBaseHook._get_credentials')
    @patch('airflow.hooks.base.BaseHook.get_connection')
    @patch('yandexcloud._wrappers.dataproc.Dataproc.delete_cluster')
    def test_delete_cluster_operator(self, delete_cluster_mock, *_):