[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.

pkg/metrics/otel.go

@@ -181,7 +181,6 @@ processors:
             aggregation_type: max
       - include: declared_resources
         action: update
-        new_name: current_declared_resources
         operations:
           - action: aggregate_labels
             label_set: []

pkg/reconcilermanager/controllers/otel_controller_test.go

@@ -47,7 +47,7 @@ const (
 	// otel-collector ConfigMap.
 	// See `CollectorConfigGooglecloud` in `pkg/metrics/otel.go`
 	// Used by TestOtelReconcilerGooglecloud.
-	depAnnotationGooglecloud = "c2f6078a9afe1f32721173e9e15bbab5"
+	depAnnotationGooglecloud = "9ede45bd37596a48556f6dbba3e9fdb3"
 	// depAnnotationGooglecloud is the expected hash of the custom
 	// otel-collector ConfigMap test artifact.
 	// Used by TestOtelReconcilerCustom.