kubeconfig: Support --proxy-url declaration

Allow callers to specify a proxy that is needed to contact the cluster. Generating a config for use from the Wikimedia Foundation production network would typically add --proxy-url http://webproxy:8080.

Bug: T394838
Bug: T400850
Change-Id: I0e0e8353a5491ac9c92439e4ba923292c0615a0f

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