[bugfix] prevent nodes from banning other nodes in ABC tests

Summary:
Core PR16898 changes the test_framework to use connect_nodes instead of
connect_nodes_bi, this changes the network topology of the tests which
led some of our abc-* tests to fail.

according to the logs nodes were disconnecting the other, these changes
add a -whitelist=noban@127.0.0.1 to prevent them from doing so
allowing the tests to complete

Test Plan:

ninja
test_runner.py abc-finalize-block abc-parkedchain

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6456