ClusterServiceCIDR determines the service CIDR for the cluster if there is no custom service CIDR, return the default if the service CIDR is set in the cluster config, use that - unless if the service CIDR is set in the installation, use that because occasionally the cluster config is incorrect.

https://kubernetes.io/docs/concepts/services-networking/cluster-ip-allocation/#avoid-ClusterIP-conflict.

NameWithLengthLimit returns a string that is the concatenation of the prefix and suffix strings.