[metric] GoogleContainerTools#2 Cleanup declared_resources metric name

The metric name was changed to `declared_resources_total` using the metricstransform processor without communicating in the documentation / release note and the intention was unclear.

This change reverts the name change and adds e2e test around all the [available metrics](http://cloud/kubernetes-engine/enterprise/config-sync/docs/how-to/monitoring-config-sync) in GCM. The check skips the counter metrics for now as they have no data when no error condition has happened.