Grafana 11 may require a change to grid template for trace grids

[arlake228]

I am not 100% sure this is the case but making a note here. I noticed that in template for grids I needed to change grafana-agent.json to look at "Extended Stats" instead of "Std Dev" on ESnet's grafana instance for trace tests. This instance is on Grafana 11 so it may be a change there. Std Dev seems to work fine on my toolkit installs that are on 10.4.4.