Tracing: Use common traceID context value for opentracing and opentelemetry (#46411) (#47786)

* use common traceID context value for opentracing and opentelemetry

* support sampled trace IDs as well

* inject traceID into NormalResponse on errors

* Finally the test passed

* fix the test

* fix linter

* change the function parameter

Co-authored-by: Ying WANG <ying.wang@grafana.com>
(cherry picked from commit 41012af997)

Co-authored-by: Serge Zaitsev <serge.zaitsev@grafana.com>

pkg/tests/api/alerting/api_admin_configuration_test.go

@@ -66,7 +66,10 @@ func TestAdminConfiguration_SendingToExternalAlertmanagers(t *testing.T) {
 		resp := getRequest(t, alertsURL, http.StatusNotFound) // nolint
 		b, err := ioutil.ReadAll(resp.Body)
 		require.NoError(t, err)
-		require.JSONEq(t, `{"message": "no admin configuration available"}`, string(b))
+		var res map[string]interface{}
+		err = json.Unmarshal(b, &res)
+		require.NoError(t, err)
+		require.Equal(t, "no admin configuration available", res["message"])
 	}
 
 	// An invalid alertmanager choice should return an error.