

**Description**

We are using a 3rd party executor which has the ability to use multiple queues, however the `default_queue` is defined under the `celery` heading and is used regardless of the executor that you are using.

See: https://github.com/apache/airflow/blob/2.0.1/airflow/models/baseoperator.py#L366

It would be nice to decouple the default_queue configuration argument away from the celery section to allow other executors to utilise this functionality with less confusion.

**Are you willing to submit a PR?**

Yep! Will open a pull request shortly


**Related Issues**

Not that I'm aware of.

airflow/configuration.py
"""Get Secret Backend if defined in airflow.cfg"""
    secrets_backend_cls = conf.getimport(section='secrets', key='backend')
    if secrets_backend_cls:
        try:
            alternative_secrets_config_dict = json.loads(
                conf.get(section='secrets', key='backend_kwargs', fallback='{}')
            )
        except JSONDecodeError:
            alternative_secrets_config_dict = {}
        return secrets_backend_cls(**alternative_secrets_config_dict)
    return None
def initialize_secrets_backends() -> List[BaseSecretsBackend]:
    """
    * import secrets backend classes
    * instantiate them and return them in a list
    """
    backend_list = []
    custom_secret_backend = get_custom_secret_backend()
    if custom_secret_backend is not None:
        backend_list.append(custom_secret_backend)
    for class_name in DEFAULT_SECRETS_SEARCH_PATH:
        secrets_backend_cls = import_string(class_name)
        backend_list.append(secrets_backend_cls())
    return backend_list
@functools.lru_cache(maxsize=None)
def _DEFAULT_CONFIG():