feat: use proto in CNS usage of client-go (#3131)

feat: use proto in client-go

Signed-off-by: Evan Baker <rbtr@users.noreply.github.com>

cns/service/main.go

@@ -1245,6 +1245,8 @@ func InitializeCRDState(ctx context.Context, httpRestService cns.HTTPService, cn
 		return errors.Wrap(err, "failed to get kubeconfig")
 	}
 	kubeConfig.UserAgent = fmt.Sprintf("azure-cns-%s", version)
+	kubeConfig.AcceptContentTypes = "application/vnd.kubernetes.protobuf,application/json"
+	kubeConfig.ContentType = "application/vnd.kubernetes.protobuf"
 
 	clientset, err := kubernetes.NewForConfig(kubeConfig)
 	if err != nil {