### Body

The CLI:

`airflow variables set [-h] [-j] [-v] key VALUE`

https://airflow.apache.org/docs/apache-airflow/stable/cli-and-env-variables-ref.html#set_repeat1

Doesn't support adding description though column exists and we support it from Rest API:
https://airflow.apache.org/docs/apache-airflow/stable/stable-rest-api-ref.html#operation/post_variables

**The Task:**

Allow to set description from cli command

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
),
    ActionCommand(
        name="export",
        help="Export all variables",
        description=(
            "All variables can be exported in STDOUT using the following command:\n"
            "airflow variables export -\n"
        ),
        func=lazy_load_command("airflow.cli.commands.variable_command.variables_export"),
        args=(ARG_VAR_EXPORT, ARG_VERBOSE),
    ),
)
DB_COMMANDS = (
    ActionCommand(
        name="init",
        help=(
            "Deprecated -- use `migrate` instead. "
            "To create default connections use `airflow connections create-default-connections`. "
            "Initialize the metadata database"
        ),
        func=lazy_load_command("airflow.cli.commands.db_command.initdb"),
        args=(ARG_VERBOSE,),
        hide=True,
    ),
    ActionCommand(
        name="check-migrations",
        help="Check if migration have finished",
        description="Check if migration have finished (or continually check until timeout)",
        func=lazy_load_command("airflow.cli.commands.db_command.check_migrations"),
        args=(ARG_MIGRATION_TIMEOUT, ARG_VERBOSE),