NFR Scale test doesn't count all reloads and batches

[pleshakov]

trafficstars

NFR Scale test doesn't count all reloads and batches.

Example of a run:

## Test TestScale_UpstreamServers

### Reloads

- Total: 61
- Total Errors: 0
- Average Time: 125ms
- Reload distribution:
	- 500ms: 61
	- 1000ms: 61
	- 5000ms: 61
	- 10000ms: 61
	- 30000ms: 61
	- +Infms: 61

### Event Batch Processing

- Total: 64
- Average Time: 232ms
- Event Batch Processing distribution:
	- 500ms: 63
	- 1000ms: 64
	- 5000ms: 64
	- 10000ms: 64
	- 30000ms: 64
	- +Infms: 64

However, looking at the NGF logs, there are 109 reloads and the last batchID is 114:

{"level":"info","ts":"2024-05-22T16:32:46Z","logger":"eventLoop.eventHandler","msg":"Finished handling the batch","batchID":64}
. . .
{"level":"info","ts":"2024-05-22T16:33:01Z","logger":"eventLoop.eventHandler","msg":"NGINX configuration was successfully updated","batchID":114}

Full log https://github.com/nginxinc/nginx-gateway-fabric/blob/d443d6a55988eae8091d230dbbd90ceef1de2c8f/tests/results/scale/edge/TestScale_UpstreamServers/ngf.log

Acceptance criteria:

• Make sure reloads and batches are counted correctly