feature: Add `Kubeconfig` status information

[embik]

Feature Description

The Kubeconfig object currently publishes zero information about its current status. It would be great if we could populate the status a bit, e.g. with a phase that we could then also use in additional printing columns.

Proposed Solution

Implement fields in the KubeconfigStatus struct, ideally a phase and maybe some other information (e.g. I think the server URL in the generated kubeconfig might be useful).

Alternative Solutions

No response

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Additional Context

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