Co-authored-by: Elad Dolev <elad@firebolt.io>
### Motivation
Give the ability to deploy multi-cluster instance on K8s clusters with non-default `clusterDomain`, and connect to external configuration-store
### Modifications
- give the ability to change cluster's name
- give the ability to change `clusterDomain`
- fix external configuration store functionality
- use broker ports variables
- use label templates, and add `component` label in several places
### Verifying this change
- [x] Make sure that the change passes the CI checks.
## Motivation
### Case
I have a physical zk cluster and want configure bookkeeper & broker & proxy to use it.
So I set components.zookeeper as false, and only found pulsar.zookeeper.connect to set my physical zk address.
But deploy stage was stucked in bookkeeper wait-zookeeper-ready container.
### Issue
The wait-zookeeper-ready initContainer in bookkeeper-cluster-initialize Job used spliced zk Service hosts to detect zk ready or not, other component init Job initContainer do the same thing. Actually, zk service are unreachable because I disabled zk component.
## Modifications
- Add optional pulsar_metadata.userProvidedZookeepers config for this case, and make component's init Job use user zk to detect liveness, instead of spliced Service hosts.
- Delete redundant image reference in bookkeeper init Job.
