### 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.
ARG_DRY_RUN,
            ARG_TASK_PARAMS,
            ARG_POST_MORTEM,
            ARG_ENV_VARS,
            ARG_MAP_INDEX,
            ARG_VERBOSE,
        ),
    ),
    ActionCommand(
        name="states-for-dag-run",
        help="Get the status of all task instances in a dag run",
        func=lazy_load_command("airflow.cli.commands.task_command.task_states_for_dag_run"),
        args=(ARG_DAG_ID, ARG_EXECUTION_DATE_OR_RUN_ID, ARG_OUTPUT, ARG_VERBOSE),
    ),
)
POOLS_COMMANDS = (
    ActionCommand(
        name="list",
        help="List pools",
        func=lazy_load_command("airflow.cli.commands.pool_command.pool_list"),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="get",
        help="Get pool size",
        func=lazy_load_command("airflow.cli.commands.pool_command.pool_get"),
        args=(ARG_POOL_NAME, ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="set",