tests: add deterministic chain generation unittest fixture

Summary:
This is a backport of core#19806 [3/8]
https://github.com/bitcoin/bitcoin/pull/19806/commits/31d225274ff1a4b245aea0a69f0e5224b0e64ca2

Note that the hash of the block in TestChain100Setup is different because Bitcoin ABC blocks have differences with Bitcoin Core blocks.
I added a test that does nothing but initialize a TestChain100DeterministicSetup to demonstrate that the hash in the assertion is correct (changing something in that string makes the test fail).

Test Plan: ninja check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D11225