Mark user-space kube-proxy as deprecated

[PriyanshuAhlawat]

This pr marks the kube-proxy in userspace mode as deprecated.
closes #32421

[sftim]

/retitle Mark user-space kube-proxy as deprecated

/sig network

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[sftim]

You can use this shortcode to mark things as deprecated @PriyanshuAhlawat

{{< feature-state for_k8s_version="v1.xx" state="deprecated" >}}

By convention, we put this shortcode immediately after the relevant heading.

PS. You have also made some unrelated whitespace changes. I recommend not making those changes in this PR; if you did make that kind of change, it should happen in its own commit.

You can use git add -p or your IDEs equivalent command to only stage specific changes.

[tengqm]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ebeb25b262154946bc6037868d2561fbf5cbb11b

Some feedback incorporated

[sftim]

/approve

[k8s-ci-robot]

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