[test] Test that wallet transactions aren't rebroadcast before 12 hours

Summary:
This is a backport of Core PR18807 [3/9]
https://github.com/bitcoin/bitcoin/pull/18807/commits/ba5498318233ab81decbc585e9619d8ffe2df1b0

Test Plan: test/functional/test_runner.py wallet_resendwallettransactions.py

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D9030