* 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
#
#
import json
import unittest
from unittest.mock import patch
from airflow.models import Connection
try:
    import yandexcloud
    from airflow.providers.yandex.hooks.yandexcloud_dataproc import DataprocHook
except ImportError:
    yandexcloud = None
CONNECTION_ID = 'yandexcloud_default'
AVAILABILITY_ZONE_ID = 'ru-central1-c'
CLUSTER_NAME = 'dataproc_cluster'
CLUSTER_IMAGE_VERSION = '1.1'
FOLDER_ID = 'my_folder_id'
SUBNET_ID = 'my_subnet_id'
S3_BUCKET_NAME_FOR_LOGS = 'my_bucket_name'
SERVICE_ACCOUNT_ID = 'my_service_account_id'
OAUTH_TOKEN = 'my_oauth_token'
SSH_PUBLIC_KEYS = [
    'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAYQCxO38tKAJXIs9ivPxt7AYdfybgtAR1ow3Qkb9GPQ6wkFHQq'
    'cFDe6faKCxH6iDRteo4D8L8BxwzN42uZSB0nfmjkIxFTcEU3mFSXEbWByg78aoddMrAAjatyrhH1pON6P0='
]
HAS_CREDENTIALS = OAUTH_TOKEN != 'my_oauth_token'
@unittest.skipIf(yandexcloud is None, 'Skipping Yandex.Cloud hook test: no yandexcloud module')
class TestYandexCloudDataprocHook(unittest.TestCase):