Mark failing node serial tests as flaky

Tracked in:
- https://github.com/kubernetes/kubernetes/issues/103690
- https://github.com/kubernetes/kubernetes/issues/103691

test/e2e_node/device_plugin_test.go

@@ -119,7 +119,7 @@ func testDevicePlugin(f *framework.Framework, pluginSockDir string) {
 			}
 			initialConfig.FeatureGates[string(features.KubeletPodResources)] = true
 		})
-		ginkgo.It("Verifies the Kubelet device plugin functionality.", func() {
+		ginkgo.It("[Flaky] Verifies the Kubelet device plugin functionality.", func() {
 			ginkgo.By("Wait for node is ready to start with")
 			e2enode.WaitForNodeToBeReady(f.ClientSet, framework.TestContext.NodeName, 5*time.Minute)
 			dp := getSampleDevicePluginPod()