fix(api): align contracts with frontend md

tests/apps/parsers/test_sources_api_e2e.py

@@ -209,16 +209,20 @@ class SourcesApiE2ETest(APITestCase):
         self.assertEqual(minprom_response.data["status"], "accepted")
         self.assertEqual(procurements_response.data["status"], "accepted")
 
-        minprom_tasks = minprom_response.data["tasks"]
-        self.assertEqual(
-            [item["task_id"] for item in minprom_tasks],
-            ["task-industrial", "task-products", "task-manufactures"],
-        )
+        self.assertEqual(set(minprom_response.data.keys()), {"task_id", "status"})
+        self.assertEqual(minprom_response.data["task_id"], "task-industrial")
         self.assertEqual(
             set(procurements_response.data.keys()),
             {"task_id", "status"},
         )
         self.assertEqual(procurements_response.data["task_id"], "task-procurements")
+        self.assertEqual(
+            BackgroundJob.objects.filter(
+                task_id__in=["task-industrial", "task-products", "task-manufactures"],
+                user_id=self.admin.id,
+            ).count(),
+            3,
+        )
         self.assertTrue(
             BackgroundJob.objects.filter(
                 task_id="task-procurements",