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