test: Update wait_until usage in abc tests not to use the one from utils

Summary:
Replace utils.wait_until with BitcoinTestFramework.wait_until,
because the latter takes timeout-factor into account which allows to
increase the timeouts for all tests on slow machines.

This is a follow-up to D10128

Test Plan: test/functional/test_runner.py abc-*

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10132