```
Whenever a transaction is added to the mempool or orphan pool, both
its txid and wtxid are considered AlreadyHave, and thus will eventually
be removed from m_txrequest.
The same is true for hashes added to the reject filter, but note that
sometimes only the wtxid is added (in which case only the wtxid can be
removed from m_txrequest).
```
Partial backport of [[https://github.com/bitcoin/bitcoin/pull/19988 | core#19988]]:
https://github.com/bitcoin/bitcoin/pull/19988/commits/173a1d2d3f824b83777ac713e89bee69fd87692d
Depends on D9552.