ClusterDomain can be different to default value `.cluster.local`

**Describe the issue**:
The library makes a strong assumption that ClusterDomain is the same for any cluster:
https://github.com/dask/dask-kubernetes/blob/1daa175f33554549a65530a26300f46368083e7e/dask_kubernetes/operator/controller/controller.py#L176-L178

and passes `DASK_SCHEDULER_ADDRESS` that always ends with `.cluster.local`. However, this part can be configured in CoreDNS to a different domain. It is useful when multiple Kubernetes clusters are set up and require unique DNS records and the ability to communicate with each other.

However, the pod tries to reach out to any other pod in the same cluster and the same domain, we don't have to specify the FQN of the cluster domain:
https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#:~:text=In%20summary%2C%20a%20Pod%20in%20the%20test%20namespace%20can%20successfully%20resolve%20either%20data.prod%20or%20data.prod.svc.cluster.local

**Minimal Complete Verifiable Example**:

Change the ClusterDomain in CoreDNS configuration to something different:
https://kubernetes.io/docs/tasks/administer-cluster/dns-custom-nameservers/

**Environment**:

- Dask version: 2024.12.1
- Python version: 3.11
- Operating System: WSL
- Install method (conda, pip, source): poetry