Removes check's dependency on validation.h. This is a step towards removing the txmempool --> validation circular dependency.
From the PR's description:
There are two functions in txmempool that need validation right now: check() and removeForReorg(). This PR removes the dependencies in check().
This concludes backport of core#23157 [8/8]
https://github.com/bitcoin/bitcoin/pull/23157/commits/082c5bf099c64e3d27abe9b68a71ce500b693e7e#diff-6875de769e90cec84d2e8a9c1b962cdbcda44d870d42e4215827e599e11e90e3
Depends on D12173
The fuzzer change is not applicable due to missing backports.