Switch couldbuilds from N1 to E2 Machines

[CecileRobertMichon]

This issue is to apply kubernetes/k8s.io#5059

In https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/cloudbuild.yaml, machineType: 'N1_HIGHCPU_8' should be replaced with machineType: E2_HIGHCPU_32

/good-first-issue

[k8s-ci-robot]

@CecileRobertMichon:
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In response to this:

This issue is to apply kubernetes/k8s.io#5059

In https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/cloudbuild.yaml, machineType: 'N1_HIGHCPU_8' should be replaced with machineType: E2_HIGHCPU_32

/good-first-issue

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