### Body

There are some use cases where users want to trigger new DAG run as soon as one finished. This is a request I've seen several times with some variations (for example like this [Stackoverflow question](https://stackoverflow.com/q/75623153/14624409)) but the basic request is the same.

The workaround users do to get such functionality is place `TriggerDagRunOperator` as last task of their DAG invoking the same DAG:

```
from datetime import datetime

from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.trigger_dagrun import TriggerDagRunOperator

with DAG(
    dag_id="example",
    start_date=datetime(2023, 1, 1,),
    catchup=False,
    schedule=None,
) as dag:
    task = EmptyOperator(task_id="first")
    trigger = TriggerDagRunOperator(
        task_id="trigger",
        trigger_dag_id="example",
    )

    task >> trigger

```

As you can see this works nicely:
![Screenshot 2023-03-03 at 14 20 51](https://user-images.githubusercontent.com/45845474/222718862-dfde8a41-24b6-4991-b318-b7f9784514f6.png)

My suggestion is to add first class support for this use case, so the above example will be changed to:

```

from datetime import datetime

from airflow import DAG
from airflow.operators.empty import EmptyOperator
from airflow.operators.trigger_dagrun import TriggerDagRunOperator

with DAG(
    dag_id="example",
    start_date=datetime(2023, 1, 1,),
    catchup=False,
    schedule="@continues",
) as dag:
    task = EmptyOperator(task_id="first")
```

I guess it won't exactly be `"@continues"` but more likely new [ScheduleArg](https://github.com/apache/airflow/blob/8b8552f5c4111fe0732067d7af06aa5285498a79/airflow/models/dag.py#L127) type but I show it like that just for simplification of the idea.

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
)
            dry_run = True
        if recursion_depth:
            warnings.warn(
                "Passing `recursion_depth` to dag.clear() is deprecated.",
                RemovedInAirflow3Warning,
                stacklevel=2,
            )
        if max_recursion_depth:
            warnings.warn(
                "Passing `max_recursion_depth` to dag.clear() is deprecated.",
                RemovedInAirflow3Warning,
                stacklevel=2,
            )
        state = []
        if only_failed:
            state += [State.FAILED, State.UPSTREAM_FAILED]
        if only_running:
            
            state += [State.RUNNING]
        tis = self._get_task_instances(
            task_ids=task_ids,
            start_date=start_date,
            end_date=end_date,
            run_id=None,
            state=state,
            include_subdags=include_subdags,
            include_parentdag=include_parentdag,
            include_dependent_dags=include_subdags,  
            session=session,