Backport note: Use a different example because we don't have a lock or `wtxid` in `RelayTransaction`
This is a backport of [[https://github.com/bitcoin/bitcoin/pull/19668 | core#19668]] [5/5]
https://github.com/bitcoin/bitcoin/pull/19668/commits/ea74e10acf17903e44c85e3678853414653dd4e1