Move the initialization of m_editorEntityUiInterface higher so that it's initialized when the interface is set up. (#4972)

Signed-off-by: Danilo Aimini <82231674+AMZN-daimini@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/UI/Outliner/EntityOutlinerWidget.cpp

@@ -153,6 +153,9 @@ namespace AzToolsFramework
     {
         initEntityOutlinerWidgetResources();
 
+        m_editorEntityUiInterface = AZ::Interface<AzToolsFramework::EditorEntityUiInterface>::Get();
+        AZ_Assert(m_editorEntityUiInterface != nullptr, "EntityOutlinerWidget requires a EditorEntityUiInterface instance on Initialize.");
+
         m_gui = new Ui::EntityOutlinerWidgetUI();
         m_gui->setupUi(this);
 
@@ -282,12 +285,6 @@ namespace AzToolsFramework
 
         m_listModel->Initialize();
 
-        m_editorEntityUiInterface = AZ::Interface<AzToolsFramework::EditorEntityUiInterface>::Get();
-
-        AZ_Assert(
-            m_editorEntityUiInterface != nullptr,
-            "EntityOutlinerWidget requires a EditorEntityUiInterface instance on Initialize.");
-
         EditorPickModeNotificationBus::Handler::BusConnect(GetEntityContextId());
         EntityHighlightMessages::Bus::Handler::BusConnect();
         EntityOutlinerModelNotificationBus::Handler::BusConnect();