test: cover v0.14.3 wallet migration

Test migratewallet on v0.14.3 non-HD and single-chain HD wallets in both
unencrypted and encrypted configurations.

Verify balances, transaction history, address ownership, descriptor
structure, encryption enforcement, backup creation, and the absence of
rescans or unexpected auxiliary wallets.

Run the test with an ASCII-only temporary directory in the Windows
cross-build job because the v0.14.3 binary cannot handle the Unicode
runner path.

.github/ci-windows-cross.py

@@ -99,23 +99,26 @@ def run_functional_tests():
         f"--tmpdirprefix={workspace / '_ _'}",
         "--combinedlogslen=99999999",
         *shlex.split(os.environ.get("TEST_RUNNER_EXTRA", "").strip()),
-        # feature_unsupported_utxo_db.py fails on Windows because of emojis in the test data directory.
+        # Tests using ancient releases fail on Windows because of emojis in the test data directory.
         "--exclude",
         "feature_unsupported_utxo_db.py",
+        "--exclude",
+        "wallet_ancient_migration.py",
     ]
     run(test_runner_cmd)
 
-    # Run feature_unsupported_utxo_db sequentially in ASCII-only tmp dir,
-    # because it is excluded above due to lack of UTF-8 support in the
+    # Run ancient release tests sequentially in ASCII-only tmp dir,
+    # because they are excluded above due to lack of UTF-8 support in the
     # ancient release.
-    cmd_feature_unsupported_db = [
-        sys.executable,
-        str(workspace / "test" / "functional" / "feature_unsupported_utxo_db.py"),
-        "--previous-releases",
-        "--tmpdir",
-        str(Path(workspace) / "test_feature_unsupported_utxo_db"),
-    ]
-    run(cmd_feature_unsupported_db)
+    for test_name in ["feature_unsupported_utxo_db", "wallet_ancient_migration"]:
+        cmd = [
+            sys.executable,
+            str(workspace / "test" / "functional" / f"{test_name}.py"),
+            "--previous-releases",
+            "--tmpdir",
+            str(workspace / f"test_{test_name}"),
+        ]
+        run(cmd)
 
 
 def run_unit_tests():