fix: disable Grafana Live to prevent port-forward timeouts

[ardentperf]

Disable Grafana Live feature (max_connections=0) to prevent WebSocket connection buildup that causes kubectl port-forward timeout errors. Firefox creates multiple persistent connections that exhausts the port-forward stream multiplexer. This causes grafana to quickly become unresponsive in the browser and the following errors to be thrown:

kubectl port-forward service/grafana-service 3000:3000 -n grafana --context kind-k8s-eu
...
Handling connection for 3000
E0108 03:26:47.977808  812338 portforward.go:351] "Unhandled Error" err="error creating error stream for port 3000 -> 3000: Timeout occurred"
E0108 03:26:47.979969  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
E0108 03:26:56.184349  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
E0108 03:27:08.983705  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
E0108 03:27:09.537632  812338 portforward.go:351] "Unhandled Error" err="error creating error stream for port 3000 -> 3000: Timeout occurred"
Handling connection for 3000
Handling connection for 3000
E0108 03:27:09.556133  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
E0108 03:27:10.928121  812338 portforward.go:351] "Unhandled Error" err="error creating error stream for port 3000 -> 3000: Timeout occurred"
E0108 03:27:10.930587  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
Handling connection for 3000
E0108 03:27:12.022278  812338 portforward.go:374] "Unhandled Error" err="error creating forwarding stream for port 3000 -> 3000: Timeout occurred"
Handling connection for 3000
Handling connection for 3000

Docs:
https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#live

[ardentperf]

I still occasionally get the same errors even with this patch, but it's much better than before. Without the patch grafana would completely break but that doesn't seem to be happening with this patch so far.