Load reporting service missing information UpstreamEndpointStats and NodeID

The load reporting service example [here](https://github.com/envoyproxy/envoy/tree/main/examples/load-reporting-service) is not working as expected according to the documentation.

There are many discrepancies between the result show in doc and the result running in sandbox.
Following are the details:

- UpstreamEndpointStats Missing
One of the most useful information from load reporting service is UpstreamEndpointStats. According to the example code at [lrs_server.go line 63](https://github.com/envoyproxy/envoy/blob/main/examples/load-reporting-service/server/lrs_server.go), we enabled this and Envoy should return the data. **However, the data is not provided based on my test. (Conducted multiple tests on this and all failed.)**

- ClusterName and NodeID Missing
As the example documentation shows, we should have information on **ClusterName** and **NodeID**.
`lrs_server_1 | 2020/02/12 17:09:07 Got stats from cluster `http_service` node `0022a319e1e2` - cluster_name:"local_service" upstream_locality_stats: total_successful_requests:21 total_issued_requests:21 > load_report_interval:`
Following are the result based on test:
- Node ID missing:
`lrs_server-1 | 2024/07/19 23:16:08 Adding new new node to cache '' `
- Cluster information missing


Thanks