ATOM-16747 RPISystemInterface::GetDefaultScene returns the scene crea… (#5153) (#5389)

* ATOM-16747 RPISystemInterface::GetDefaultScene returns the scene created by PreviewRenderer but not the Main Scene
Deprecate GetDefaultScene() function.
Update all the places which use GetDefaultScene to use Scene::GetFeatureProcessorFromEntityId or GetMainScene.
Tested with Editor, UI Editor, Material Editor, game launcher.

Signed-off-by: Qing Tao <55564570+VickyAtAZ@users.noreply.github.com>
(cherry picked from commit 8da6bea073)

Gems/AtomLyIntegration/AtomBridge/Code/Source/AtomDebugDisplayViewportInterface.cpp

@@ -256,12 +256,11 @@ namespace AZ::AtomBridge
         viewportContextPtr->ConnectSceneChangedHandler(m_sceneChangeHandler);
     }
 
-    AtomDebugDisplayViewportInterface::AtomDebugDisplayViewportInterface(uint32_t defaultInstanceAddress)
+    AtomDebugDisplayViewportInterface::AtomDebugDisplayViewportInterface(uint32_t defaultInstanceAddress, RPI::Scene* scene)
     {
         ResetRenderState();
         m_viewportId = defaultInstanceAddress;
         m_defaultInstance = true;
-        RPI::Scene* scene = RPI::RPISystemInterface::Get()->GetDefaultScene().get();
         InitInternal(scene, nullptr);
     }