CloudWatch/Logs: Don't group dataframes for non time series queries for non live path (#38915)

* Use the same grouping function in legacy code

* Add error propagation

* Fix tests

* Fix tests

pkg/tests/api/metrics/api_metrics_test.go

@@ -129,9 +129,6 @@ func TestQueryCloudWatchLogs(t *testing.T) {
 				Fields: []*data.Field{
 					data.NewField("logGroupName", nil, []*string{}),
 				},
-				Meta: &data.FrameMeta{
-					PreferredVisualization: "logs",
-				},
 			},
 		}