Deploy pipeline to the DE region

[bmckerry]

As we spin up the DE region we should get deploys working to the replay-analyzer there.
Region deploy details:

    GCP_PROJECT = sentry-eu-west3
    GKE_CLUSTER = primary
    GKE_REGION = europe-west3
    GKE_BASTION_ZONE = a

GKE_CLUSTER_ZONE isn't needed.

Ideally we should also get the replay-analyzer on pipedream deploys so it's easier to deploy to new regions (such as ST regions when replays are on for those), @IanWoodard may be able to help with that