Merge #18866: test: Fix verack race to avoid intermittent test failures

Summary:
fae153b40968bfd974a4709bcd841a59447abf18 test: Fix verack race to avoid intermittent test failures (MarcoFalke)

Pull request description:

Fixes #18832

ACKs for top commit:

laanwj:
  ACK fae153b40968bfd974a4709bcd841a59447abf18

Tree-SHA512: 071de8c8e2b2787c9433c7460e18b9a54beaf471a52ce848c5ac7263fc2a40f5b976d4f558ecc494fd0fa07284b7c98d29267cade58f80ab74fe9a7d18d94298

Backport of Core PR18866

Test Plan: ninja check-functional

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7434