mark test_task_workflow_trigger_success as flaky (#42972) (#43580)

(cherry picked from commit f1735b4)

Co-authored-by: GPK <[email protected]>
(cherry picked from commit 0286c95)

Author: utkarsharma2

tests/triggers/test_external_task.py

@@ -42,6 +42,7 @@ class TestWorkflowTrigger:
     RUN_ID = "external_task_run_id"
     STATES = ["success", "fail"]
 
+    @pytest.mark.flaky(reruns=5)
     @mock.patch("airflow.triggers.external_task._get_count")
     @pytest.mark.asyncio
     async def test_task_workflow_trigger_success(self, mock_get_count):