Fix feedback email test for on_commit task enqueue

Execute on_commit callbacks so OutboundEmail ImmediateBackend send runs
inside TestCase transactions, matching invite/reset coverage.

llm_be/chat_backend/tests/test_views_users.py

@@ -375,17 +375,21 @@ class FeedbackViewTestCase(APITestCase):
         self.url = reverse("feedbacks")
 
     def test_post_creates_feedback_and_notifies(self):
-        response = self.client.post(
-            self.url,
-            {"title": "Broken button", "text": "It does nothing"},
-            format="json",
-        )
+        with self.captureOnCommitCallbacks(execute=True):
+            response = self.client.post(
+                self.url,
+                {"title": "Broken button", "text": "It does nothing"},
+                format="json",
+            )
 
         self.assertEqual(response.status_code, status.HTTP_201_CREATED)
         feedback = Feedback.objects.get()
         self.assertEqual(feedback.user, self.user)
         self.assertEqual(len(mail.outbox), 1)
         self.assertIn("Broken button", mail.outbox[0].body)
+        outbound = OutboundEmail.objects.get(user=self.user)
+        self.assertEqual(outbound.kind, OutboundEmail.Kind.FEEDBACK)
+        self.assertEqual(outbound.status, OutboundEmail.Status.SENT)
 
     def test_post_without_text_is_rejected(self):
         response = self.client.post(self.url, {"title": "no body"}, format="json")