Leverage ACM Policies to automatically bootstrap Managed Clusters

[benswinney]

Currently to bootstrap a managed cluster, we first use an ACM policy to deploy ArgoCD into the managed Cluster, we then create a ACM Application to point to an ArgoCD bootstrap.yaml within the Spoke Clusters folder, located within the otp-gitops repository.

A more elegant solution would be to utilise a Policy instead to perform this action.