[Improvement][WorkerGroup]  Optimize and reduce database and zookeeper queries and replace worker address input with multiple-select (#5182)

* [Improvement][Server] Optimize and reduce database and ZooKeeper query

* [Improvement][WorkerGroup] Replace worker address input with multiple-select

* [Improvement][WorkerGroup] Fix unit test

* [Improvement][API&UI] Optimize long host to short host and long host display in k8s