ModifyMgmtKubeconfig modifies the stored kubeconfig, so it's working on macOS.

ModifyVclusterWorkloadKubeconfig todo.

ModifyWorkloadKubeconfig modifies the stored kubeconfig, so it's working on macOS.

RetrieveMgmtKubeconfig retrieves of the newly provisioned mgmt-cluster via capd and stores it to the work directory of frigg.

RetrieveVclusterWorkloadKubeconfig todo.

RetrieveWorkloadKubeconfig retrieves kubeconfig of the workload cluster.