Initial draft for save all prefabs workflow

Signed-off-by: srikappa-amzn <srikappa@amazon.com>

Code/Editor/EditorPreferencesPageGeneral.h

@@ -14,6 +14,7 @@
 #include <AzCore/Math/Vector3.h>
 #include <AzQtComponents/Components/Widgets/ToolBar.h>
 #include <AzToolsFramework/Editor/EditorSettingsAPIBus.h>
+#include <AzToolsFramework/Entity/PrefabEditorEntityOwnershipService.h>
 #include <QIcon>
 
 #include "Settings.h"
@@ -57,6 +58,12 @@ private:
         bool m_enableSceneInspector;
     };
 
+    struct PrefabSettings
+    {
+        AZ_TYPE_INFO(PrefabSettings, "{E297DAE3-3985-4BC2-8B43-45F3B1522F6B}");
+        AzToolsFramework::SavePrefabsPreference m_savePrefabsPreference;
+    };
+
     struct Messaging
     {
         AZ_TYPE_INFO(Messaging, "{A6AD87CB-E905-409B-A2BF-C43CDCE63B0C}")
@@ -89,6 +96,7 @@ private:
     };
 
     GeneralSettings m_generalSettings;
+    PrefabSettings m_prefabSettings;
     Messaging m_messaging;
     Undo m_undo;
     DeepSelection m_deepSelection;