fix: prioritize current-context based on file order

[hhk7734]

What type of PR is this?

/kind bug
(?)

What this PR does / why we need it:

kubectl config current-context command retrieves the current-context from the first file with a non-empty value when multiple files are provided. In contrast, config.list_kube_config_contexts() returns the current-context from the last file with a value. Since developers are likely to expect the behavior aligned with kubectl, I created this PR to adjust the priority.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

I'm guessing that https://github.com/kubernetes/client-go/blob/18a1faa115ed571de5af3e8f0f9c02973769ceb3/tools/clientcmd/loader.go#L246-L273 is relevant, and client-go probably works the same way.

Does this PR introduce a user-facing change?

NONE?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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