Add export for BuiltinNode in TSL.js (#31726)

src/nodes/TSL.js

@@ -55,6 +55,7 @@ export * from './accessors/UniformArrayNode.js';
 export * from './accessors/Bitangent.js';
 export * from './accessors/BufferAttributeNode.js';
 export * from './accessors/BufferNode.js';
+export * from './accessors/BuiltinNode.js';
 export * from './accessors/Camera.js';
 export * from './accessors/VertexColorNode.js';
 export * from './accessors/CubeTextureNode.js';