Also move a couple of BitcoinABC functions into PeerManagerImpl because they require access to `State`
This is a partial backport of [[https://github.com/bitcoin/bitcoin/pull/24543 | core#24543]]
https://github.com/bitcoin/bitcoin/pull/24543/commits/37ecaf3e7a028486a0a1c9b717e8eb4214215805
Depends on D14861