[net] remove CConnman::MarkAddressGood

Summary:

It just forwards calls to CAddrMan::Good.

Partial backport of core#20228:
https://github.com/bitcoin/bitcoin/pull/20228/commits/bcd7f30b7944892db7ae37069175804567bb0cdf

Depends on D12248.

Test Plan:

ninja all check

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D12249