Backport 10.0: Split KAS k8s-proxy into its own HTTPRoute

Clemens Beckrequested to merge
cb/kas-gatewayapi-fix-190 into 10-0-stable

What does this MR do?

Backport !5156 (merged) to GitLab 19.0/GitLab chart 10.0.

Relates #6557 (closed)

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