[test] import descriptor wallet with reorged parent + IsFromMe child in mempool

Test that wallet rescans process transactions topologically, even if a
parent's entry into the mempool is later than that of its child.
This behavior is important because IsFromMe requires the ability to look
up a transaction's inputs.

Co-authored-by: furszy <matiasfurszyfer@protonmail.com>

test/functional/test_runner.py

@@ -335,6 +335,7 @@ BASE_SCRIPTS = [
     'wallet_create_tx.py --descriptors',
     'wallet_inactive_hdchains.py --legacy-wallet',
     'wallet_spend_unconfirmed.py',
+    'wallet_rescan_unconfirmed.py --descriptors',
     'p2p_fingerprint.py',
     'feature_uacomment.py',
     'feature_init.py',