[Model Runner V2] Add dummy profile_cudagraph_memory API (#36520)

Signed-off-by: Woosuk Kwon <woosuk@inferact.ai>

vllm/v1/worker/gpu/model_runner.py

@@ -473,6 +473,10 @@ class GPUModelRunner(LoRAModelRunnerMixin):
         # SP is not supported yet.
         return num_scheduled_tokens
 
+    def profile_cudagraph_memory(self) -> int:
+        # NOTE(woosuk): It is TBD whether we keep this API or not.
+        return 0
+
     @torch.inference_mode()
     def capture_model(self) -> int:
         if not self.cudagraph_manager.needs_capture():