### 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.
help=(
        "Ignores depends_on_past dependencies for the first "
        "set of tasks only (subsequent executions in the backfill "
        "DO respect depends_on_past)"
    ),
    action="store_true",
)
ARG_POOL = Arg(("--pool",), "Resource pool to use")
ARG_DELAY_ON_LIMIT = Arg(
    ("--delay-on-limit",),
    help=(
        "Amount of time in seconds to wait when the limit "
        "on maximum active dag runs (max_active_runs) has "
        "been reached before trying to execute a dag run "
        "again"
    ),
    type=float,
    default=1.0,
)
ARG_RESET_DAG_RUN = Arg(
    ("--reset-dagruns",),
    help=(
        "if set, the backfill will delete existing "
        "backfill-related DAG runs and start "
        "anew with fresh, running DAG runs"
    ),
    action="store_true",
)
ARG_RERUN_FAILED_TASKS = Arg(
    ("--rerun-failed-tasks",),