Remove http from the ingress

[jlewi]

I think if we add the annotation

   kubernetes.io/ingress.allow-http: "false" 

We could disallow http on the ingress. IAP also forces an automatic http to https redirect but it might be nice to disallow http traffic altogether.

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[jlewi]

https://cloud.google.com/kubernetes-engine/docs/concepts/ingress-xlb#disabling_http

[jlewi]

I checked it and it worked.