### 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="links",
        help="List extra links registered by the providers",
        func=lazy_load_command("airflow.cli.commands.provider_command.extra_links_list"),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="widgets",
        help="Get information about registered connection form widgets",
        func=lazy_load_command("airflow.cli.commands.provider_command.connection_form_widget_list"),
        args=(
            ARG_OUTPUT,
            ARG_VERBOSE,
        ),
    ),
    ActionCommand(
        name="hooks",
        help="List registered provider hooks",
        func=lazy_load_command("airflow.cli.commands.provider_command.hooks_list"),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="triggers",
        help="List registered provider triggers",
        func=lazy_load_command("airflow.cli.commands.provider_command.triggers_list"),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="behaviours",
        help="Get information about registered connection types with custom behaviours",