Currently it's somewhat of a pain to add modifications to dashboards because these are JSON inside yaml files, formatting issues etc etc.

It'll be nice if we can have some dashboard directory somewhere where we store dashboards in json. and we can run some script to auto generate grafana_dashboard_dashboards_noparse.yaml from them. then we can apply it as we're currently applying it.

related #364

https://github.com/prometheus/test-infra/blob/master/prombench/manifests/cluster-infra/grafana_dashboard_dashboards_noparse.yaml