BTN-2322 Update domain cluster

The cluster domain name has been changed from the default Kubernetes one (cluster.local) to a new SKA specific one (techops.internal.skao.int) by System Team. We have in a previous ticket made sure that the cluster_domain is a global variable in our helm charts so the only job we should have to update to the new one is to change this default to point to the new cluster domain name. The defaults are present in any project chart that uses SKUID (ODA, OET, ODT services) and in both the main chart and in the umbrella chart values.yaml files.