cmd/k8s-operator: add support for running an auth proxy

Updates #5055

Signed-off-by: Maisem Ali <maisem@tailscale.com>

go.mod

@@ -86,6 +86,7 @@ require (
 	inet.af/wf v0.0.0-20220728202103-50d96caab2f6
 	k8s.io/api v0.25.0
 	k8s.io/apimachinery v0.25.0
+	k8s.io/client-go v0.25.0
 	nhooyr.io/websocket v1.8.7
 	sigs.k8s.io/controller-runtime v0.13.1
 	sigs.k8s.io/yaml v1.3.0
@@ -314,7 +315,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	howett.net/plist v1.0.0 // indirect
 	k8s.io/apiextensions-apiserver v0.25.0 // indirect
-	k8s.io/client-go v0.25.0 // indirect
 	k8s.io/component-base v0.25.0 // indirect
 	k8s.io/klog/v2 v2.70.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect