Split providers out of the main "airflow/" tree into a UV workspace project (#42505)

This is only a partial split so far. It moves all the code and tests, but
leaves the creation of `core/` to a separate PR as this is already large
enough.

In addition to the straight file rename the other changes I had to make here
are:

- Some mypy/typing fixes.

  Mypy can be fragile about what it picks up when, so maybe some of those
  changes were caused by that. But the typing changes aren't large.

- Improve typing in common.sql type stub

  Again, likely a mypy file oddity, but the types should be safe

- Removed the `check-providers-init-file-missing` check

  This isn't needed now that airflow/providers shouldn't exist at all in the
  main tree.

- Create a "dev.tests_common" package that contains helper files and common
  pytest fixtures

  Since the provider tests are no longer under tests/ they don't automatically
  share the fixtures from the parent `tests/conftest.py` so they needed
  extracted.

  Ditto for `tests.test_utils` -- they can't be easily imported in provider
  tests anymore, so they are moved to a more explicit shared location.

In future we should switch how the CI image is built to make better use of UV
caching than our own approach as that would remvoe a lot of custom code.

Author: ashb

providers/src/airflow/providers/cncf/kubernetes/executors/kubernetes_executor.py

@@ -482,6 +482,7 @@ def _change_state(
             self.running.remove(key)
         except KeyError:
             self.log.debug("TI key not in running, not adding to event_buffer: %s", key)
+            return
 
         # If we don't have a TI state, look it up from the db. event_buffer expects the TI state
         if state is None:

providers/src/airflow/providers/cncf/kubernetes/executors/kubernetes_executor_utils.py

@@ -273,16 +273,6 @@ def process_status(
                 (pod_name, namespace, TaskInstanceState.FAILED, annotations, resource_version)
             )
         elif status == "Succeeded":
-            # We get multiple events once the pod hits a terminal state, and we only want to
-            # send it along to the scheduler once.
-            # If our event type is DELETED, or the pod has a deletion timestamp, we've already
-            # seen the initial Succeeded event and sent it along to the scheduler.
-            if event["type"] == "DELETED" or pod.metadata.deletion_timestamp:
-                self.log.info(
-                    "Skipping event for Succeeded pod %s - event for this pod already sent to executor",
-                    pod_name,
-                )
-                return
             self.log.info("Event: %s Succeeded, annotations: %s", pod_name, annotations_string)
             self.watcher_queue.put((pod_name, namespace, None, annotations, resource_version))
         elif status == "Running":

providers/tests/cncf/kubernetes/executors/test_kubernetes_executor.py

@@ -784,6 +784,21 @@ def test_change_state_adopted(self, mock_delete_pod, mock_get_kube_client, mock_
         finally:
             executor.end()
 
+    @pytest.mark.db_test
+    @mock.patch("airflow.providers.cncf.kubernetes.executors.kubernetes_executor_utils.KubernetesJobWatcher")
+    @mock.patch("airflow.providers.cncf.kubernetes.kube_client.get_kube_client")
+    def test_change_state_key_not_in_running(self, mock_get_kube_client, mock_kubernetes_job_watcher):
+        executor = self.kubernetes_executor
+        executor.start()
+        try:
+            key = ("dag_id", "task_id", "run_id", "try_number1")
+            executor.running = set()
+            executor._change_state(key, State.SUCCESS, "pod_name", "default")
+            assert executor.event_buffer.get(key) is None
+            assert executor.running == set()
+        finally:
+            executor.end()
+
     @pytest.mark.db_test
     @pytest.mark.parametrize(
         "multi_namespace_mode_namespace_list, watchers_keys",
@@ -1858,14 +1873,6 @@ def test_process_status_succeeded(self):
         # We don't know the TI state, so we send in None
         self.assert_watcher_queue_called_once_with_state(None)
 
-    def test_process_status_succeeded_dedup_timestamp(self):
-        self.pod.status.phase = "Succeeded"
-        self.pod.metadata.deletion_timestamp = timezone.utcnow()
-        self.events.append({"type": "MODIFIED", "object": self.pod})
-
-        self._run()
-        self.watcher.watcher_queue.put.assert_not_called()
-
     @pytest.mark.parametrize(
         "ti_state",
         [