Cluster domain is hardcoded for Jetstream installer

[harmjanblok]

Currently the jetstream installer hardcoded the cluster domain to cluster.local, for example on controllers/eventbus/installer/jetstream.go#L626.

For clusters that override the default with the --cluster-domain kubelet flag, the cluster domain part should probably be configurable.

Should this be part of the EventBus spec?

Originally posted by @harmjanblok in https://github.com/argoproj/argo-events/discussions/2158