unittests: Skip failing Windows tests

Some of the unit tests are currently failing on Windows.

Skip them for now, and remove the skips later, once the underlying issues
have been resolved.

pkg/proxy/apis/config/validation/validation_test.go

@@ -514,6 +514,10 @@ func testValidateProxyModeLinux(t *testing.T) {
 }
 
 func testValidateProxyModeWindows(t *testing.T) {
+	// TODO: remove skip once the test has been fixed.
+	if runtime.GOOS == "windows" {
+		t.Skip("Skipping failing test on Windows.")
+	}
 	newPath := field.NewPath("KubeProxyConfiguration")
 	for name, testCase := range map[string]struct {
 		mode         kubeproxyconfig.ProxyMode