validation: Pass in chainstate to ::NotifyHeaderTip
validation: Pass in chainstate to ::NotifyHeaderTip

Summary:
[META] This commit should be followed up by removing the comments and  assertions meant only to show that the change is correct.

This is a backport of [[https://github.com/bitcoin/bitcoin/pull/20749 | core#20749]] [11/17]
https://github.com/bitcoin/bitcoin/pull/20749/commits/2a696472a1423e877bfa83f016f66c7e45be7369

Depends on D11182

Test Plan: `ninja all check-all`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11183

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