[diffusion] CI: deprecate WarmupRunner in CI (#18038)

Co-authored-by: Mick <mickjagger19@icloud.com>

python/sglang/multimodal_gen/runtime/managers/gpu_worker.py

@@ -186,7 +186,9 @@ class GPUWorker:
 
             # TODO: extract to avoid duplication
             if req.perf_dump_path is not None or envs.SGLANG_DIFFUSION_STAGE_LOGGING:
-                PerformanceLogger.log_request_summary(timings=output_batch.timings)
+                # Avoid logging warmup perf records that share the same request_id.
+                if not req.is_warmup:
+                    PerformanceLogger.log_request_summary(timings=output_batch.timings)
         except Exception as e:
             logger.error(
                 f"Error executing request {req.request_id}: {e}", exc_info=True