SERVER-91920 added admission and execution control queueing stats to _logSlowTransaction in `TransactionParticipant`. We should support tracking and outputting these metrics at the router level within `TransactionRouter::_logSlowTransaction` as well. We'll need to figure out where the right place to store and accumulate these stats are at the router level, whether within the TransactionRouter::MetricsTracker, ObservableState, etc.