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>

bin/__dispatch.sh

@@ -19,10 +19,6 @@ case "${TARGET_TOOL}" in
   stern)
     attr="third_party.stern"
     ;;
-  kms_pass)
-    attr="ops.kms_pass"
-    TARGET_TOOL="pass"
-    ;;
   aoc2019)
     attr="fun.aoc2019.${1}"
     ;;