refactor: add replayprotectionactivationtime option in chainstatemanager

Summary: This removes the last Bitcoin ABC specific gArgs access in validation code. The next commit (backport) removes gArgs from validation.cpp

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18692