[backport#16404] qa: Test ZMQ notification after chain reorg

Summary:
https://github.com/bitcoin/bitcoin/pull/16404/commits/abdfc5e89b687f73de4ab97e924c29cc27e71c15

Depends on D7343

Concludes backport of Core PR16404 and PR16740 (PR16404 on its own is broken and will not pass the tests otherwise, sorry)

notes:

* ditto as the note for D7343 re: callsite of socket.connect(address)

Test Plan:

./test/functional/test_runner.py interface_zmq

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7344