Updates node-exporter and cAdvisor

In addition to updating node-exporter and cAdvisor to the latest version, this release removes two node-exporter instances from the Prometheus pods in the prometheus-federation and data-processing clusters. Those instances were only used to collect metrics on the persistent disk, but similar metrics are already exported by the kubelet and collected by Prometheus. This PR modifies any dashboards, alerts and configurations that were dependent on the node-exporter metrics and converts them to use the metrics exported by the kubelet.