install kubernetes-dashboard from cern-metachart

Installation of kubernetes-dashboard via cern metachart will only be available on version 0.12.0 onwards.

DependsOn: kubernetes/automation/releases/cern-magnum!92 (merged)

Closes: https://gitlab.cern.ch/kubernetes/project/-/issues/202

Change-Id: Icaff87cf6780d065d79d1965238efcab05dfe842