Add support for border in Focus Mode (#4692)

* restore component mode border

Signed-off-by: hultonha <hultonha@amazon.co.uk>

* add viewport border for focus mode, remove dead code in ObjectManager

Signed-off-by: hultonha <hultonha@amazon.co.uk>

* ensure the focus mode border is restored when leaving component mode

Signed-off-by: hultonha <hultonha@amazon.co.uk>

* update FocusModeNotification call order after merge from development

Signed-off-by: hultonha <hultonha@amazon.co.uk>

Code/Editor/Objects/ObjectManager.h

@@ -20,7 +20,6 @@
 #include "ObjectManagerEventBus.h"
 
 #include <AzCore/std/smart_ptr/unique_ptr.h>
-#include <AzToolsFramework/API/ViewportEditorModeTrackerNotificationBus.h>
 #include <AzCore/EBus/EBus.h>
 #include <AzCore/Component/Component.h>
 #include <Include/SandboxAPI.h>
@@ -59,7 +58,6 @@ public:
  */
 class CObjectManager
     : public IObjectManager
-    , private AzToolsFramework::ViewportEditorModeNotificationsBus::Handler
 {
 public:
     //! Selection functor callback.
@@ -330,12 +328,6 @@ private:
 
     void FindDisplayableObjects(DisplayContext& dc, bool bDisplay);
 
-    // ViewportEditorModeNotificationsBus overrides ...
-    void OnEditorModeActivated(
-        const AzToolsFramework::ViewportEditorModesInterface& editorModeState, AzToolsFramework::ViewportEditorMode mode) override;
-    void OnEditorModeDeactivated(
-        const AzToolsFramework::ViewportEditorModesInterface& editorModeState, AzToolsFramework::ViewportEditorMode mode) override;
-
 private:
     typedef std::map<GUID, CBaseObjectPtr, guid_less_predicate> Objects;
     Objects m_objects;