### 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)

"""Get a connection."""
    try:
        conn = BaseHook.get_connection(args.conn_id)
    except AirflowNotFoundException:
        raise SystemExit("Connection not found.")
    AirflowConsole().print_as(
        data=[conn],
        output=args.output,
        mapper=_connection_mapper,
    )
@suppress_logs_and_warning
@providers_configuration_loaded
def connections_list(args):