Use same pool name as k8s boskos

I had been using unique pool names for the benefit of
monitoring.prow.k8s.io but now that I understand a bit more about how
prometheus scrapes that data, I'm going to redo it to support
per-instance dashboards

infra/gcp/clusters/projects/k8s-infra-prow-build/prow-build/resources/boskos-resources.yaml

@@ -49,4 +49,4 @@ resources:
   - k8s-infra-e2e-boskos-scale-04
   - k8s-infra-e2e-boskos-scale-05
   state: dirty
-  type: k8s-infra-scale-project
+  type: scalability-project