### Body

In the Pools UI we don't show the description column though we do have it:
https://github.com/apache/airflow/blob/99eeb84c820c8a380721e5d40f5917a01616b943/airflow/models/pool.py#L56

and we have it in the API:
https://github.com/apache/airflow/pull/19841

The task:
Expose the column in the UI
![Screenshot 2023-10-04 at 17 08 05](https://github.com/apache/airflow/assets/45845474/4ed7ed5b-8d42-4a72-b271-07d07066f914)


### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
"""Import variables."""
        try:
            variable_dict = json.loads(request.files["file"].read())
            action_on_existing = request.form.get("action_if_exists", "overwrite").lower()
        except Exception:
            self.update_redirect()
            flash("Missing file or syntax error.", "error")
            return redirect(self.get_redirect())
        else:
            existing_keys = set()
            if action_on_existing != "overwrite":
                existing_keys = set(
                    session.scalars(select(models.Variable.key).where(models.Variable.key.in_(variable_dict)))
                )
            if action_on_existing == "fail" and existing_keys:
                failed_repr = ", ".join(repr(k) for k in sorted(existing_keys))
                flash(f"Failed. The variables with these keys: {failed_repr}  already exists.")