Prevent policy `includes` duplication in advanced routing configuration#3819

shaun-nx merged 1 commit intorelease-2.1nginx/nginx-gateway-fabric:release-2.1from

cherry-pick/bug/clientsettingspolicy-multiple-route-rulenginx/nginx-gateway-fabric:cherry-pick/bug/clientsettingspolicy-multiple-route-ruleCopy head branch name to clipboard