[v9.5.x] Cloudwatch: Pass refId from query for expression queries (#66434)

Co-authored-by: Shirley <4163034+fridgepoet@users.noreply.github.com>
Co-authored-by: Isabella Siu <Isabella.siu@grafana.com>
(cherry picked from commit 6309d3fae6)

pkg/tsdb/cloudwatch/log_sync_query.go

@@ -65,9 +65,14 @@ var executeSyncLogQuery = func(ctx context.Context, e *cloudWatchExecutor, req *
 			frames = data.Frames{dataframe}
 		}
 
-		respD := resp.Responses["A"]
+		refId := "A"
+		if q.RefID != "" {
+			refId = q.RefID
+		}
+
+		respD := resp.Responses[refId]
 		respD.Frames = frames
-		resp.Responses["A"] = respD
+		resp.Responses[refId] = respD
 	}
 
 	return resp, nil