**Update**

We discussed and decide this CLI should always only clean up pods created by Airflow.

<hr>

### Description

Currently command `kubernetes cleanup-pods` cleans up Pods that meet specific conditions in a given namespace.

Underlying code: https://github.com/apache/airflow/blob/2.0.1/airflow/cli/commands/kubernetes_command.py#L70

### Use case / motivation

The problem to me is: users may have other non-Airflow stuff running in this specific namespace, and they may want to have different strategy/logic for Pod cleaning-up for these non-Airflow pods.

We may want to have an additional boolean flag for this command, like `--only-airflow-pods`, so that users can decide if they only want to clean up Airflow-created Pods.

It should not be hard to identify Airflow-created pods, given the specific labels Airflow adds to the Pods it creates (https://github.com/apache/airflow/blob/2.0.1/airflow/kubernetes/pod_generator.py#L385)




airflow/cli/cli_parser.py
"""Creates and returns command line argument parser"""
    parser = DefaultHelpParser(prog="airflow", formatter_class=AirflowHelpFormatter)
    subparsers = parser.add_subparsers(dest='subcommand', metavar="GROUP_OR_COMMAND")
    subparsers.required = True
    command_dict = DAG_CLI_DICT if dag_parser else ALL_COMMANDS_DICT
    subparser_list = command_dict.keys()
    sub_name: str
    for sub_name in sorted(subparser_list):
        sub: CLICommand = command_dict[sub_name]
        _add_command(subparsers, sub)
    return parser
def _sort_args(args: Iterable[Arg]) -> Iterable[Arg]:
    """Sort subcommand optional args, keep positional args"""
    def get_long_option(arg: Arg):