chore(ops): Clean up old GCP infrastructure files

This removes almost all of the GCP-infrastructure leftovers from my
previous setup.

The DNS configuration is retained, but moves to my user folder
instead.

Change-Id: I1867acd379443882f11a3c645846c9902eadd5b0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/782
Tested-by: BuildkiteCI
Reviewed-by: eta <eta@theta.eu.org>
Reviewed-by: isomer <isomer@tvl.fyi>

users/tazjin/cloud-dns/import

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -ue
+
+# Imports a zone file into a Google Cloud DNS zone of the same name
+readonly ZONE="${1}"
+
+gcloud dns record-sets import "${ZONE}" \
+       --project composite-watch-759 \
+       --zone-file-format \
+       --delete-all-existing \
+       --zone "${ZONE}"