[site-reviews] Use the user nickname as the response-by name

add_filter('site-reviews/review/build/tag/response/by', function ($responseBy, $review) {
    if ($user = get_userdata($review->meta()->_response_by)) {
        $responseBy = get_user_meta($user->ID, 'nickname', true);
    }
    return $responseBy;
}, 10, 2);