[WIP] Optimize Helios accuracy-maintained path

Signed-off-by: hsliuustc0106 <liuhongsheng4@huawei.com>

benchmarks/diffusion/backends.py

@@ -278,7 +278,7 @@ async def async_request_v1_videos(
                 return output
 
         # invoke a poll request (GET /v1/videos/{video_id})
-        poll_interval = 2.0  # Unit(s)
+        poll_interval = 0.2  # Unit(s)
         timeout_seconds = 600.0
         deadline = time.perf_counter() + timeout_seconds
         job_url = f"{input.api_url}/{job_id}"