Add `node.kubernetes.io/instance-type` label to nodes

[viveksyngh]

Is your feature request related to a problem? Please describe.

We would like to add node.kubernetes.io/instance-type labels to nodes provisioned using CAPVCD similar to other cloud provider node.kubernetes.io/instance-type.

https://kubernetes.io/docs/reference/labels-annotations-taints/#nodekubernetesioinstance-type

Describe the solution you'd like

We can add the sizing policy of VCDMachine object as instanceType of the nodes. These labels can be added as metadata in init or join configuration of the nodes.

Check the original issue vmware/cluster-api-provider-cloud-director#536

Describe alternatives you've considered

No response

Additional context

No response

[srekkas]

Would be nice to have labels e.g. worker pool name, instance size (large, medium ..)