bugifx: resolve crash with project manager (#5151)

- system allocator not configured in environment for AZQtComponents
- WA_DeleteOnClose will destroy the toast dialog causing a crashing when ToastNotificationsView tries to access the pointer

issue: https://github.com/o3de/o3de/issues/5129
Signed-off-by: Michael Pollind <mpollind@gmail.com>

Code/Framework/AzQtComponents/AzQtComponents/Components/ToastNotification.cpp

@@ -27,7 +27,6 @@ namespace AzQtComponents
         setProperty("HasNoWindowDecorations", true);
 
         setAttribute(Qt::WA_ShowWithoutActivating);
-        setAttribute(Qt::WA_DeleteOnClose);
 
         m_borderRadius = toastConfiguration.m_borderRadius;
         if (m_borderRadius > 0)

Code/Framework/AzQtComponents/AzQtComponents/Components/ToastNotification.h

@@ -31,7 +31,6 @@ namespace AzQtComponents
     {
         Q_OBJECT
     public:    
-        AZ_CLASS_ALLOCATOR(ToastNotification, AZ::SystemAllocator, 0);
         
         ToastNotification(QWidget* parent, const ToastConfiguration& toastConfiguration);
         virtual ~ToastNotification();
@@ -73,7 +72,7 @@ namespace AzQtComponents
 
         AZ_PUSH_DISABLE_DLL_EXPORT_MEMBER_WARNING
         AZStd::chrono::milliseconds m_fadeDuration;
-        AZStd::unique_ptr<Ui::ToastNotification> m_ui;        
+        QScopedPointer<Ui::ToastNotification> m_ui;        
         AZ_POP_DISABLE_DLL_EXPORT_MEMBER_WARNING
     };
 } // namespace AzQtComponents

Code/Framework/AzQtComponents/AzQtComponents/Components/ToastNotificationConfiguration.h

@@ -27,7 +27,6 @@ namespace AzQtComponents
     class AZ_QT_COMPONENTS_API ToastConfiguration
     {
     public:
-        AZ_CLASS_ALLOCATOR(ToastConfiguration, AZ::SystemAllocator, 0);
         ToastConfiguration(ToastType toastType, const QString& title, const QString& description);
 
         bool m_closeOnClick = true;

Code/Framework/AzToolsFramework/AzToolsFramework/UI/Notifications/ToastNotificationsView.cpp

@@ -129,7 +129,7 @@ namespace AzToolsFramework
 
     ToastId ToastNotificationsView::CreateToastNotification(const AzQtComponents::ToastConfiguration& toastConfiguration)
     {
-        AzQtComponents::ToastNotification* notification = aznew AzQtComponents::ToastNotification(parentWidget(), toastConfiguration);
+        AzQtComponents::ToastNotification* notification = new AzQtComponents::ToastNotification(this, toastConfiguration);
         ToastId toastId = AZ::Entity::MakeId();
         m_notifications[toastId] = notification;