Menu::Item doesn't use the `:if` option
The `:if` option is saved into @condition, but it doesn't appear to be used anywhere: https://github.com/theforeman/foreman/blob/3347fa49d500964f0209122d8d36c920d1feafcc/app/registries/menu/item.rb#L14
One suggestion is to use @condition in the `to_hash` method to control if the menu item is used or not.
It is also advertised that a Proc can be passed into the `:if` option. This functionality should also be re-implemented. (https://github.com/theforeman/foreman/blob/develop/app/registries/menu/manager.rb#L60)