test: Disable ui dashboard test for gke

The dashboard is disabled on GKE 1.10, the test is failing because it's
not alive. Let's just skip this use-case, and keep a todo that it'd be
nice to enable the dashboard to test it.

test/e2e/ui/dashboard.go

@@ -33,6 +33,11 @@ import (
 )
 
 var _ = SIGDescribe("Kubernetes Dashboard", func() {
+	BeforeEach(func() {
+		// TODO(kubernetes/kubernetes#61559): Enable dashboard here rather than skip the test.
+		framework.SkipIfProviderIs("gke")
+	})
+
 	const (
 		uiServiceName = "kubernetes-dashboard"
 		uiAppName     = uiServiceName