Prevent bundling aggregations for state events (#9619)

There's no need to do aggregation bundling for state events. Doing so can cause performance issues.

changelog.d/9619.misc

@@ -0,0 +1 @@
+Prevent attempting to bundle aggregations for state events in /context APIs.

synapse/rest/admin/rooms.py

@@ -685,7 +685,10 @@ class RoomEventContextServlet(RestServlet):
             results["events_after"], time_now
         )
         results["state"] = await self._event_serializer.serialize_events(
-            results["state"], time_now
+            results["state"],
+            time_now,
+            # No need to bundle aggregations for state events
+            bundle_aggregations=False,
         )
 
         return 200, results

synapse/rest/client/v1/room.py

@@ -671,7 +671,10 @@ class RoomEventContextServlet(RestServlet):
             results["events_after"], time_now
         )
         results["state"] = await self._event_serializer.serialize_events(
-            results["state"], time_now
+            results["state"],
+            time_now,
+            # No need to bundle aggregations for state events
+            bundle_aggregations=False,
         )
 
         return 200, results