### 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.
#
#
#
from __future__ import annotations
import os
from contextlib import redirect_stdout
from io import StringIO
import pytest
from airflow import models
from airflow.cli import cli_parser
from airflow.cli.commands import variable_command
from airflow.models import Variable
from tests.test_utils.db import clear_db_variables
class TestCliVariables: