Bugfix/caplog flaky test in extra operator link test (apache#44331)

* Fix Flaky test that uses CapLog to test Serialization

* Fix Flaky test that uses CapLog to test Serialization

tests/serialization/test_dag_serialization.py

@@ -1067,10 +1067,13 @@ def test_extra_serialized_field_and_operator_links(
         assert "https://www.google.com" == link
 
     @pytest.mark.usefixtures("clear_all_logger_handlers")
-    def test_extra_operator_links_logs_error_for_non_registered_extra_links(self, caplog):
+    def test_extra_operator_links_logs_error_for_non_registered_extra_links(self):
         """
         Assert OperatorLinks not registered via Plugins and if it is not an inbuilt Operator Link,
-        it can still deserialize the DAG (does not error) but just logs an error
+        it can still deserialize the DAG (does not error) but just logs an error.
+
+        We test NOT using caplog as this is flaky, we check that the task after deserialize
+        is missing the extra links.
         """
 
         class TaskStateLink(BaseOperatorLink):
@@ -1094,13 +1097,8 @@ def execute(self, context: Context):
 
         serialized_dag = SerializedDAG.to_dict(dag)
 
-        with caplog.at_level("ERROR", logger="airflow.serialization.serialized_objects"):
-            SerializedDAG.from_dict(serialized_dag)
-
-        expected_err_msg = (
-            "Operator Link class 'tests.serialization.test_dag_serialization.TaskStateLink' not registered"
-        )
-        assert expected_err_msg in caplog.text
+        sdag = SerializedDAG.from_dict(serialized_dag)
+        assert sdag.task_dict["blah"].operator_extra_links == []
 
     class ClassWithCustomAttributes:
         """