Ingress: Stop streaming response if stream is EOF

An empty data chunk signifies EOF. Stop streaming the response in
that case.

See https://github.com/aio-libs/aiohttp/blob/v3.12.13/aiohttp/streams.py#L471-L474.

supervisor/api/ingress.py

@@ -280,6 +280,8 @@ class APIIngress(CoreSysAttributes):
                 response.headers["X-Accel-Buffering"] = "no"
                 await response.prepare(request)
                 async for data, _ in result.content.iter_chunks():
+                    if not data:
+                        break
                     await response.write(data)
 
             except (