### 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.
"and then run by an executor."
        ),
        func=lazy_load_command("airflow.cli.commands.task_command.task_failed_deps"),
        args=(ARG_DAG_ID, ARG_TASK_ID, ARG_EXECUTION_DATE_OR_RUN_ID, ARG_SUBDIR, ARG_MAP_INDEX, ARG_VERBOSE),
    ),
    ActionCommand(
        name="render",
        help="Render a task instance's template(s)",
        func=lazy_load_command("airflow.cli.commands.task_command.task_render"),
        args=(
            ARG_DAG_ID,
            ARG_TASK_ID,
            ARG_EXECUTION_DATE_OR_RUN_ID,
            ARG_SUBDIR,
            ARG_VERBOSE,
            ARG_MAP_INDEX,
        ),
    ),
    ActionCommand(
        name="run",
        help="Run a single task instance",
        func=lazy_load_command("airflow.cli.commands.task_command.task_run"),
        args=(
            ARG_DAG_ID,
            ARG_TASK_ID,
            ARG_EXECUTION_DATE_OR_RUN_ID,
            ARG_SUBDIR,
            ARG_MARK_SUCCESS,
            ARG_FORCE,
            ARG_POOL,