### 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_DB_OUTPUT_PATH = Arg(
    ("--output-path",),
    metavar="DIRPATH",
    help="The path to the output directory to export the cleaned data. This directory must exist.",
    required=True,
)
ARG_DB_DROP_ARCHIVES = Arg(
    ("--drop-archives",),
    help="Drop the archive tables after exporting. Use with caution.",
    action="store_true",
)
ARG_DB_RETRY = Arg(
    ("--retry",),
    default=0,
    type=positive_int(allow_zero=True),
    help="Retry database check upon failure",
)
ARG_DB_RETRY_DELAY = Arg(
    ("--retry-delay",),
    default=1,
    type=positive_int(allow_zero=False),
    help="Wait time between retries in seconds",
)
ARG_POOL_NAME = Arg(("pool",), metavar="NAME", help="Pool name")
ARG_POOL_SLOTS = Arg(("slots",), type=int, help="Pool slots")
ARG_POOL_DESCRIPTION = Arg(("description",), help="Pool description")
ARG_POOL_INCLUDE_DEFERRED = Arg(
    ("--include-deferred",), help="Include deferred tasks in calculations for Pool", action="store_true"
)
ARG_POOL_IMPORT = Arg(