StreamAggregatedResources warning logs on 2.41+

Hello,

After upgrading esp to 2.41 the following warning logs started:

```[24][config]StreamAggregatedResources gRPC config stream to @espv2-ads-cluster closed since 317673s ago: 14, upstream connect error or disconnect/reset before headers. reset reason: connection termination```

I'm using it in GKE with http only, with the following args:
```
args:
[
"--listener_port=8081",
"--backend=my-service:8080",
"--service=my-service",
"--rollout_strategy=managed",
"-z",
"healthz"
]
```

What can I do to fix this?

The issue names no source files, tests, or code entry points. Start by reproducing the warning after upgrading ESP v2 to 2.41 with the supplied GKE arguments and HTTP-only configuration. Done means identifying why the StreamAggregatedResources stream closes and documenting or implementing a verified fix.

Written by the indexing model from the issue text.