### 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_SKIP_SERVE_LOGS = Arg(
    ("-s", "--skip-serve-logs"),
    default=False,
    help="Don't start the serve logs process along with the workers",
    action="store_true",
)
ARG_DAG_ID_REQ_FLAG = Arg(
    ("-d", "--dag-id"), required=True, help="The id of the dag"
)  
ARG_NO_BACKFILL = Arg(
    ("--no-backfill",), help="filter all the backfill dagruns given the dag id", action="store_true"
)
dagrun_states = tuple(state.value for state in DagRunState)
ARG_DR_STATE = Arg(
    ("--state",),
    help="Only list the DAG runs corresponding to the state",
    metavar=", ".join(dagrun_states),
    choices=dagrun_states,
)
ARG_DAG_ID_OPT = Arg(("-d", "--dag-id"), help="The id of the dag")
ARG_LIMIT = Arg(("--limit",), help="Return a limited number of records")
job_states = tuple(state.value for state in JobState)
ARG_JOB_STATE = Arg(
    ("--state",),
    help="Only list the jobs corresponding to the state",
    metavar=", ".join(job_states),
    choices=job_states,
)
ARG_NUM_EXECUTIONS = Arg(