validation: Pass in chainstate to UpdateMempoolForReorg

Summary:
This is a backport of core#20750 [16/17]
https://github.com/bitcoin/bitcoin/pull/20750/commits/0a9a24d8c717e88e36e16014630cec8eada8dfcb

Depends on D11202

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11203