test: Add missing syncwithvalidationinterfacequeue

Summary:

The wallet rebroadcast functionality learns about new blocks via the validation interface queue. To avoid test failures such as https://ci.appveyor.com/project/DrahtBot/bitcoin/builds/31119387#L466 , we can sync with the queue before advancing the test.

This is a backport of Core PR18228

Test Plan: test/functional/test_runner.py wallet_resend*

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D8830