[rebalance] Change the implementation of Admin#getServerNodes() as introducing a new API to get cluster information
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Description
### Search before asking
- [x] I searched in the [issues](https://github.com/alibaba/fluss/issues) and found nothing similar.
### Description
Change the implementation of Admin#getServerNodes() as introducing a new API to get cluster information. In this way, we can realizing get ServerTag from this API instead of introducing a new API like `showServerTags`
### Willingness to contribute
- [ ] I'm willing to submit a PR!
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