During the mempool rewrite CheckTX's functionality was accidentally changed to fail all CheckTxKind::Recheck calls. Previously attempting to re-insert a transaction into the mempool would not cause an error.

This is a UX regression as CometBFT is used to display to users the possible statuses of their transactions. We should allow the CheckTxKind::Recheck calls to succeed until we have better ways to report to users the status of their transactions. Nice to have also is basic unit testing for CheckTX.

┆Issue Number: ENG-811