### 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)

func=lazy_load_command("airflow.cli.commands.dag_command.dag_report"),
        args=(ARG_SUBDIR, ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name="list-runs",
        help="List DAG runs given a DAG id",
        description=(
            "List DAG runs given a DAG id. If state option is given, it will only search for all the "
            "dagruns with the given state. If no_backfill option is given, it will filter out all "
            "backfill dagruns for given dag id. If start_date is given, it will filter out all the "
            "dagruns that were executed before this date. If end_date is given, it will filter out "
            "all the dagruns that were executed after this date. "
        ),
        func=lazy_load_command("airflow.cli.commands.dag_command.dag_list_dag_runs"),
        args=(
            ARG_DAG_ID_REQ_FLAG,
            ARG_NO_BACKFILL,
            ARG_DR_STATE,
            ARG_OUTPUT,
            ARG_VERBOSE,
            ARG_START_DATE,
            ARG_END_DATE,
        ),
    ),
    ActionCommand(
        name="list-jobs",
        help="List the jobs",
        func=lazy_load_command("airflow.cli.commands.dag_command.dag_list_jobs"),
        args=(ARG_DAG_ID_OPT, ARG_JOB_STATE, ARG_LIMIT, ARG_OUTPUT, ARG_VERBOSE),
    ),