remove the chi-node-14-verylarge runner from the shared pool
we've had multiple cases of users abusing our runners (e.g. #41032 (closed)) which wouldn't be that bad if it wasn't blocking production for our users. i was under the impression that a single job wasn't supposed to block the runner, which is why it was acceptable to have it in the shared pool, but because this is blocking urgent production work for @mikeperry and others, we should, as a stopgap, remove it from the shared pool.