Update SubMenuItem to delegate items call to SubMenu

Author: mrmir

.changeset/hip-clowns-visit.md

@@ -0,0 +1,5 @@
+---
+'@openproject/primer-view-components': patch
+---
+
+Delegate the items call to SubMenu of ActionMenu component

app/components/primer/alpha/action_menu/sub_menu_item.rb

@@ -6,6 +6,8 @@ class ActionMenu
       # This component is part of <%= link_to_component(Primer::Alpha::ActionMenu) %> and should not be
       # used as a standalone component.
       class SubMenuItem < ::Primer::Alpha::ActionList::Item
+        delegate :items, to: :@sub_menu
+
         def initialize(content_arguments: {}, form_arguments: {}, **system_arguments)
           # We extract form_arguments from system_arguments here to avoid passing them to the
           # ActionList::Item base class or to the SubMenu instance. Doing so prevents a form