capz: explicit TEST_WINDOWS=true for Windows test

[jackfrancis]

This PR pairs with kubernetes-sigs/cluster-api-provider-azure#5906 to ensure that we grab the right Kubernetes version when building a CAPZ cluster that will include Windows nodes.

[jackfrancis]

/assign @mboersma

[marosset]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, marosset

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[k8s-ci-robot]

@jackfrancis: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key cluster-api-provider-azure-presubmits-main.yaml using file config/jobs/kubernetes-sigs/cluster-api-provider-azure/cluster-api-provider-azure-presubmits-main.yaml
• key cluster-api-provider-azure-presubmits-release-v1beta1.yaml using file config/jobs/kubernetes-sigs/cluster-api-provider-azure/cluster-api-provider-azure-presubmits-release-v1beta1.yaml

In response to this:

This PR pairs with kubernetes-sigs/cluster-api-provider-azure#5906 to ensure that we grab the right Kubernetes version when building a CAPZ cluster that will include Windows nodes.

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