Add Optional lab to create Spoke cluster using kro/ACK instead of Terraform

[allamand]

With this we will allow the creation of Spoke clusters to be created only from Kubernetes APIs, using combinaison of kro/ACK and Argo CD to create the cluster and register it to the fleet management.

with that, terraform will not be needed at all for managing spoke clusters.

[thatmlopsguy]

See ack-eks-cluster

[allamand]

@thatmlopsguy thanks, it will be more like https://github.com/kro-run/kro/tree/main/examples/aws/eks-cluster-mgmt