### Description

Currently, the `airflow variables export` command requires an explicit file path and does not support output to stdout. However connections can be printed to stdout using `airflow connections export -`. This inconsistency between the two export commands can lead to confusion and limits the flexibility of the variables export command.

### Use case/motivation

To bring some consistency, similar to connections, variables should also be printed to STDOUT, using `-` instead of filename. 

### Related issues

_No response_

### Are you willing to submit a PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Deletes connection from DB."""
    with create_session() as session:
        try:
            to_delete = session.scalars(select(Connection).where(Connection.conn_id == args.conn_id)).one()
        except exc.NoResultFound:
            raise SystemExit(f"Did not find a connection with `conn_id`={args.conn_id}")
        except exc.MultipleResultsFound:
            raise SystemExit(f"Found more than one connection with `conn_id`={args.conn_id}")
        else:
            session.delete(to_delete)
            print(f"Successfully deleted connection with `conn_id`={to_delete.conn_id}")
@cli_utils.action_cli(check_db=False)
@providers_configuration_loaded
def connections_import(args):