Unable to add list items in item-list.html.twig
There is no such thing as #value, you want #markup instead, There are also better ways to create links, although I'm not 100% sure right now if you can provide #wrapper_attributes then, but you can call getRenderable() on the link, then you get a render array and should be able to it on that.:

\Drupal\Core\Link::fromTextAndUrl($value['name'], \Drupal\Core\Url::fromUri('http://test.com'))