test: adjust chainstate tests to use recognized snapshot base

Summary:
In future commits, loading the block index while making use of a
snapshot is contingent on the snapshot being recognized by chainparams.

Ensure all existing unittests that use snapshots use a recognized
snapshot (at height 110).

Co-authored-by: Ryan Ofsky <ryan@ofsky.org>

This is a partial backport of core#27596
https://github.com/bitcoin/bitcoin/pull/27596/commits/49ef778158c43859946a592e11ec34fe1b93a5b6

Test Plan: ninja check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17753