test: ensure reason is checked for invalid blocks rejection
Summary:
This concludes backport of core#32591
https://github.com/bitcoin/bitcoin/pull/32591/commits/8fcd6845052354fad80ae7e5feda3f6a2e441e12
Depends on D18928
Test Plan:
test/functional/test_runner.py feature_block p2p_invalid_tx
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D18929