Change notification buses to be addressed on EntityContextId, and connect the handlers to the default id. Request interfaces should not need that id as they can retrieve it from the entityId.

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

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabFocusHandler.cpp

@@ -96,6 +96,10 @@ namespace AzToolsFramework::Prefab
             else
             {
                 containerEntityId = AZ::EntityId();
+
+                // Clear the selection
+                AzToolsFramework::SelectEntities({});
+                
             }
             
             // Focus on the descendants of the container entity

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabFocusNotificationBus.h

@@ -17,12 +17,19 @@ namespace AzToolsFramework::Prefab
     class PrefabFocusNotifications
         : public AZ::EBusTraits
     {
-    protected:
-        ~PrefabFocusNotifications() = default;
-
     public:
+        //////////////////////////////////////////////////////////////////////////
+        // EBusTraits overrides
+        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
+        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::ById;
+        using BusIdType = AzFramework::EntityContextId;
+        //////////////////////////////////////////////////////////////////////////
+        
         //! Triggered when the editor focus is changed to a different prefab.
         virtual void OnPrefabFocusChanged() = 0;
+
+    protected:
+        ~PrefabFocusNotifications() = default;
     };
 
     using PrefabFocusNotificationBus = AZ::EBus<PrefabFocusNotifications>;