Fix cern-magnum hook priority on first class components: (occm and calico)

In recent versions of cern-magnum we install most of the components via helm chart.

kube-prometheus-stack has some components that run as pre-hook which are halting the full cluster release because they fail. One option is to disable/remove the pre-hook from the respective components, the other option is to split the cluster main deployments from the add-on applications.

We will try to make this configurable in the kube-prometheus-stack repo upstream