ds-querier: return QDR instead of k8s error (#95184)

* ds-querier: return QDR instead of k8s error

After parseQuery we know the request is a valid k8s request but we don't
know if the query is valid, therefore this change returns a QDR that
other systems, e.g. alerting ruler, can de-serialize properly.

Co-authored-by: Gábor Farkas <gabor.farkas@gmail.com>

* ds-querier: fix tests

Co-authored-by: Sarah Zinger <sarah.zinger@grafana.com>

* tweak status

* refactor refID to empty

---------

Co-authored-by: Gábor Farkas <gabor.farkas@gmail.com>
Co-authored-by: Sarah Zinger <sarah.zinger@grafana.com>

pkg/tests/apis/query/query_test.go

@@ -139,14 +139,14 @@ func TestIntegrationSimpleQuery(t *testing.T) {
 
 		require.Error(t, err, "expecting a 400")
 		require.JSONEq(t, `{
-			"kind": "Status",
-			"apiVersion": "v1",
-			"metadata": {},
-			"status": "Failure",
-			"message": "[sse.dependencyError] did not execute expression [Y] due to a failure to of the dependent expression or query [X]",
-			"reason": "Invalid",
-			"code": 400
-		  }`, string(body))
+			"results": {
+				"": {
+					"error": "[sse.dependencyError] did not execute expression [Y] due to a failure to of the dependent expression or query [X]",
+					"status": 400,
+					"errorSource": ""
+				}
+			}
+		}`, string(body))
 		// require.JSONEq(t, `{
 		// 	"status": "Failure",
 		// 	"metadata": {},