Fix dag.clear usages after change from apache#9824 (apache#9909)

apache#9824 introduced changes in the signature of dag.clear(...) 
but not all occurrences of invocation were adjusted.

TESTING.rst

@@ -979,7 +979,8 @@ It will run a backfill job:
 .. code-block:: python
 
   if __name__ == '__main__':
-    dag.clear(reset_dag_runs=True)
+    from airflow.utils.state import State
+    dag.clear(dag_run_state=State.NONE)
     dag.run()
 
 

docs/executor/debug.rst

@@ -43,7 +43,8 @@ It will run a backfill job:
 .. code-block:: python
 
   if __name__ == '__main__':
-    dag.clear(reset_dag_runs=True)
+    from airflow.utils.state import State
+    dag.clear(dag_run_state=State.NONE)
     dag.run()
 
 

tests/test_utils/system_tests_class.py

@@ -26,6 +26,7 @@
 from airflow.models.dagbag import DagBag
 from airflow.utils.file import mkdirs
 from airflow.utils.log.logging_mixin import LoggingMixin
+from airflow.utils.state import State
 from tests.test_utils import AIRFLOW_MAIN_FOLDER
 from tests.utils.logging_command_executor import get_executor
 
@@ -149,7 +150,7 @@ def run_dag(self, dag_id: str, dag_folder: str = DEFAULT_DAG_FOLDER) -> None:
             )
 
         self.log.info("Attempting to run DAG: %s", dag_id)
-        dag.clear(reset_dag_runs=True)
+        dag.clear(dag_run_state=State.NONE)
         try:
             dag.run(ignore_first_depends_on_past=True, verbose=True)
         except Exception: