### Description

Airflow Connection testing using airflow CLI would be very useful  , where users can quick add test function to test connection in their applications. It will benefit CLI user to create and test new connections right from instance and reduce time on troubleshooting any connection issue. 

### Use case/motivation

airflow connection testing using airflow CLI , similar function as we have in Airflow CLI. 
example:  airflow connection test "hello_id"

### Related issues

N/A

### Are you willing to submit a PR?

- [ ] 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)

"Execute one single DagRun for a given DAG and execution date.\n"
            "\n"
            "The --imgcat-dagrun option only works in iTerm.\n"
            "\n"
            "For more information, see: https://www.iterm2.com/documentation-images.html\n"
            "\n"
            "If --save-dagrun is used, then, after completing the backfill, saves the diagram "
            "for current DAG Run to the indicated file.\n"
            "The file format is determined by the file extension. "
            "For more information about supported format, "
            "see: https://www.graphviz.org/doc/info/output.html\n"
            "\n"
            "If you want to create a PNG file then you should execute the following command:\n"
            "airflow dags test <DAG_ID> <EXECUTION_DATE> --save-dagrun output.png\n"
            "\n"
            "If you want to create a DOT file then you should execute the following command:\n"
            "airflow dags test <DAG_ID> <EXECUTION_DATE> --save-dagrun output.dot\n"
        ),
        func=lazy_load_command("airflow.cli.commands.dag_command.dag_test"),
        args=(
            ARG_DAG_ID,
            ARG_EXECUTION_DATE_OPTIONAL,
            ARG_CONF,
            ARG_SUBDIR,
            ARG_SHOW_DAGRUN,
            ARG_IMGCAT_DAGRUN,
            ARG_SAVE_DAGRUN,
            ARG_VERBOSE,
        ),
    ),