Add wallets_conflicts

Test the case of a tx being conflicted by multiple
txs with different depths. The conflicted tx is also spent by
a child tx for which confirmation status is tied to the parent's.
After a reorg of conflicting txs, the conflicted status should be
undone properly.

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

test/functional/test_runner.py

@@ -192,6 +192,8 @@ BASE_SCRIPTS = [
     'wallet_watchonly.py --legacy-wallet',
     'wallet_watchonly.py --usecli --legacy-wallet',
     'wallet_reorgsrestore.py',
+    'wallet_conflicts.py --legacy-wallet',
+    'wallet_conflicts.py --descriptors',
     'interface_http.py',
     'interface_rpc.py',
     'interface_usdt_coinselection.py',