WINC-1777: register windows-machine-config-operator OTE binary

Register wmco-tests-ext.gz in the extension registry so that
openshift-tests can discover and invoke WINC OTE tests automatically
in Prow periodic/presubmit jobs.

Related: openshift/windows-machine-config-operator#3874

Author: weinliu

pkg/test/extensions/binary.go

@@ -211,6 +211,10 @@ var extensionBinaries = []TestBinary{
 		imageTag:   "machine-config-operator",
 		binaryPath: "/usr/bin/machine-config-tests-ext.gz",
 	},
+	{
+		imageTag:   "windows-machine-config-operator",
+		binaryPath: "/usr/bin/wmco-tests-ext.gz",
+	},
 	{
 		imageTag:   "cluster-monitoring-operator",
 		binaryPath: "/usr/bin/cluster-monitoring-operator-tests-ext.gz",