[Refactor]: startup process

[themanforfree]

Description about the feature

Currently, before XlineServer starts, we need to get information such as cluster_info and db, and these logics are scattered in the main and test cluster implementations, if these logics changed, we need to modify multiple locations, which is a very bad implementation, so we need to refactor the XlineServer startup logic and use the same sub-methods in all locations

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