Under PV1, ReplicationCoordinatorImpl::_handleTimePassing for a single node RS should start an election instead of auto-winning.

Running _performPostMemberStateUpdateAction(kActionWinElection) races with the election timeout in PV1 and can lead to an invariant failure. If we instead use kActionStartSingleNodeElection instead the race will be benign and simply result in a log message about "Not standing for election again; already candidate".