[backport#19507] Add test case for mempool->block zmq notification
Summary:
https://github.com/bitcoin/bitcoin/pull/19507/commits/2399a0600ca9c4b676fa2f97520b8ecc44642246
Depends on D7346
Partial backport of Core PR19507
Test Plan:
test_runner.py interface_zmq
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D7347