Pull credentials from fleet for all clusters (#2647)

All clusters have switched to using private APIs.

jetty/deploy-nomulus-for-env.sh

@@ -33,13 +33,7 @@ while read line
 do
   parts=(${line})
   echo "Updating cluster ${parts[0]} in location ${parts[1]}..."
-  if [[ ${environment} == "crash" ]]
-  then
   gcloud container fleet memberships get-credentials "${parts[0]}" --project "${project}"
-  else
-    gcloud container clusters get-credentials "${parts[0]}" \
-    --project "${project}" --location "${parts[1]}"
-  fi
   for service in frontend backend pubapi console
   do
     sed s/GCP_PROJECT/"${project}"/g "./kubernetes/nomulus-${service}.yaml" | \