Hello,

Our Helm Chart uses the command that is deleted in Airflow 2.0. We should consider what we want to do with it - add this command again or delete the reference to this command in the Helm Chart.
https://github.com/apache/airflow/blob/d41c6a46b176a80e1cdb0bcc592f5a8baec21c41/chart/templates/scheduler/scheduler-deployment.yaml#L177-L197
Related PR: 
https://github.com/apache/airflow/pull/6843

Best regards,
Kamil Breguła
CC: @dstandish 
airflow/cli/cli_parser.py
ARG_CONN_PORT = Arg(('--conn-port',), help='Connection port, optional when adding a connection', type=str)
ARG_CONN_EXTRA = Arg(
    ('--conn-extra',), help='Connection `Extra` field, optional when adding a connection', type=str
)
ARG_CONN_EXPORT = Arg(
    ('file',),
    help='Output file path for exporting the connections',
    type=argparse.FileType('w', encoding='UTF-8'),
)
ARG_CONN_EXPORT_FORMAT = Arg(
    ('--format',), help='Format of the connections data in file', type=str, choices=['json', 'yaml', 'env']
)
ARG_CONN_IMPORT = Arg(("file",), help="Import connections from a file")
# providers
ARG_PROVIDER_NAME = Arg(
    ('provider_name',), help='Provider name, required to get provider information', type=str
)
ARG_FULL = Arg(
    ('-f', '--full'),
    help='Full information about the provider, including documentation information.',
    required=False,
    action="store_true",
)
# users
ARG_USERNAME = Arg(('-u', '--username'), help='Username of the user', required=True, type=str)
ARG_USERNAME_OPTIONAL = Arg(('-u', '--username'), help='Username of the user', type=str)
ARG_FIRSTNAME = Arg(('-f', '--firstname'), help='First name of the user', required=True, type=str)
ARG_LASTNAME = Arg(('-l', '--lastname'), help='Last name of the user', required=True, type=str)
ARG_ROLE = Arg(
    ('-r', '--role'),