Make sure GCP sizing is updated with changes done in Azure week of 6/3
We should go back through the items we had done in https://gitlab.com/gitlab-com/infrastructure/issues/4314 and make sure we scale up GCP hosts similar to what we had done in Azure as needed.
* [x] API nodes
* [x] Sidekiq workers
* [x] Worker chef roles for sidekiq queues
* [x] Any further tuning of NFS nodes
* [x] Pgbouncer changes if any
* [x] Prometheus?
cc @andrewn
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