⚠️ Move InstanceID from Spec to Status

[mdbooth]

This is a status field and should not be included in the spec. ProviderID is the same, but cannot be removed as it is required by Cluster API.

This PR replaces https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/1961 with a smaller scope.

TODO:

• [x] Integrate restorev1alpha6MachineTemplateMachineSpec into https://github.com/kubernetes-sigs/cluster-api-provider-openstack/pull/1989

/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth

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[mdbooth]

/test pull-cluster-api-provider-openstack-e2e-full-test

[jichenjc]

/lgtm

looks good

[mdbooth]

/hold cancel