Nutanix: MAPI machine-controller fails to handle the windows-user-data

When running the nutanix-e2e-windows test from the WMCO PR https://github.com/openshift/windows-machine-config-operator/pull/1398, the MAPI nutanix-controller failed to create the Windows machine VM with the below error logs. It failed to marshal the windows-user-data to struct IgnitionConfig, since the windows-user-data is in powershell script format, but not the ignition data format.

I0424 17:37:43.472054       1 recorder.go:103] events "msg"="ci-op-zhi8pd1k-5c595-dnpj5-e2e-wm-f84vt: reconciler failed to Create machine: failed to get user data: Failed to unmarshal userData to IgnitionConfig. invalid character '<' looking for beginning of value" "object"={"kind":"Machine","namespace":"openshift-machine-api","name":"ci-op-zhi8pd1k-5c595-dnpj5-e2e-wm-f84vt","uid":"d3981cb0-4f98-4424-9252-b100521c2a93","apiVersion":"machine.openshift.io/v1beta1","resourceVersion":"31045"} "reason"="FailedCreate" "type"="Warning"
E0424 17:37:43.472923       1 controller.go:329]  "msg"="Reconciler error" "error"="ci-op-zhi8pd1k-5c595-dnpj5-e2e-wm-f84vt: reconciler failed to Create machine: failed to get user data: Failed to unmarshal userData to IgnitionConfig. invalid character '<' looking for beginning of value" "controller"="machine-controller" "name"="ci-op-zhi8pd1k-5c595-dnpj5-e2e-wm-f84vt" "namespace"="openshift-machine-api" "object"={"name":"ci-op-zhi8pd1k-5c595-dnpj5-e2e-wm-f84vt","namespace":"openshift-machine-api"} "reconcileID"="16572b5d-2418-4f7c-b7a8-5f08f2659391"

When the Machine is configured to be Windows node

Run the ci/prow/nutanix-e2e-operator test.

The MAPI nutanix-controller failed to create the Windows VM with the error logs showing above.

The Windows VM and node can be successfully created and provisioned.