Merge GetRenderable and GetSelectedRenderable

PiperOrigin-RevId: 943844092
Change-Id: Ia3888ea6c289d491ddb2fba0ea4f5799c367ef2c

src/render/filament/support/renderable_manager.h

@@ -58,6 +58,9 @@ class RenderableManager {
   // Applies the visualization options to the renderables in the scene.
   void Apply(const mjvOption& vopts);
 
+  RenderableManager(const RenderableManager&) = delete;
+  RenderableManager& operator=(const RenderableManager&) = delete;
+
  private:
   void AddGeomGeoms();
   void AddSiteGeoms();
@@ -72,8 +75,6 @@ class RenderableManager {
 
   int GetSegmentationId(mjtObj obj_type, int obj_index);
 
-  mjrfRenderable* GetSelectedRenderable();
-
   mjrfContext* ctx_;
   mjrfScene* scene_;
   ModelObjects* model_objects_;