Fix QA::EE::Page::Component::DesignManagement view paths

THe feature was moved to Core but since the views/selectors sanity check
was broken, we only noticed this here.
Signed-off-by: Rémy Coutable <remy@rymai.me>

qa/qa.rb

@@ -409,6 +409,7 @@ module QA
       autoload :Breadcrumbs, 'qa/page/component/breadcrumbs'
       autoload :CiBadgeLink, 'qa/page/component/ci_badge_link'
       autoload :ClonePanel, 'qa/page/component/clone_panel'
+      autoload :DesignManagement, 'qa/page/component/design_management'
       autoload :LazyLoader, 'qa/page/component/lazy_loader'
       autoload :LegacyClonePanel, 'qa/page/component/legacy_clone_panel'
       autoload :Dropzone, 'qa/page/component/dropzone'

qa/qa/page/component/design_management.rb

@@ -6,7 +6,9 @@ module QA
       module DesignManagement
         extend QA::Page::PageConcern
 
-        def self.prepended(base)
+        def self.included(base)
+          super
+
           base.class_eval do
             view 'app/assets/javascripts/design_management/components/design_notes/design_discussion.vue' do
               element :design_discussion_content