fix: apiserver watcher refresh shouldn't crash plugin manager

[jimassa]

Description

This PR modifies the APIServer watcher to improve error handling and optimize performance:

1. Error Handling: Instead of returning a resolution error to the caller, watcher now retries the host lookup, after 3 refresh, if we still can't resolve the apiserver IP, we bail and return the error to the watcher manager.
2. Optimization: Moved the hostname retrieval to the initialization function. This change ensures that the hostname is obtained once during initialization and not on every refresh, as the hostname does not change.

Related Issue

#565

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