add ingress classs as nondefault resource

Author: kaitoii11

tests/e2e/main_test.go

@@ -256,6 +256,7 @@ func TestDefaultCollectorMetricsAvailable(t *testing.T) {
 	nonDefaultResources := map[string]bool{
 		"clusterrole":           true,
 		"clusterrolebinding":    true,
+		"ingressclass":          true,
 		"role":                  true,
 		"rolebinding":           true,
 		"serviceaccount":        true,