While working on SERVER-45339, we re-realized why we originally wanted to make the recovery task bump the txnNumber used to send _recvChunkStart.

It is to prevent an old donor primary from sending _recvChunkStart after the new donor primary has already completed the recovery, because this would cause a new range deletion task to be written on the recipient that would never get cleaned up.

This ticket should make the donor persist the lsid and txnNumber used to send _recvChunkStart again, and make the recovery task do a dummy write using the lsid and txnNumber + 1 on the recipient before sending the decision to the recipient.