refactor(rendering): rename stage graph contract files

engine/include/XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h

@@ -40,7 +40,7 @@ class RenderSurface;
 
 namespace Pipelines {
 namespace Internal {
-struct BuiltinForwardMainSceneGraphBuilder;
+struct BuiltinForwardStageGraphBuilder;
 } // namespace Internal
 } // namespace Pipelines
 
@@ -385,7 +385,7 @@ private:
     RHI::RHIResourceView* m_skyboxBoundCubemapTextureView = nullptr;
     SceneRenderFeatureHost m_forwardSceneFeatureHost;
 
-    friend struct Internal::BuiltinForwardMainSceneGraphBuilder;
+    friend struct Internal::BuiltinForwardStageGraphBuilder;
 };
 
 class BuiltinForwardPipelineAsset final : public RenderPipelineAsset {