test: remove legacy wallet functional tests

Removes all legacy wallet specific functional tests.

Also removes the --descriptor and --legacy-wallet options as these are
no longer necessary with the legacy wallet removed.

test/functional/wallet_migration.py

@@ -35,9 +35,6 @@ from test_framework.wallet_util import (
 
 
 class WalletMigrationTest(BitcoinTestFramework):
-    def add_options(self, parser):
-        self.add_wallet_options(parser)
-
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 2
@@ -909,22 +906,6 @@ class WalletMigrationTest(BitcoinTestFramework):
             _, _, magic = struct.unpack("QII", data)
             assert_equal(magic, BTREE_MAGIC)
 
-        ####################################################
-        # Perform the same test with a loaded legacy wallet.
-        # The wallet should remain loaded after the failure.
-        #
-        # This applies only when BDB is enabled, as the user
-        # cannot interact with the legacy wallet database
-        # without BDB support.
-        if self.is_bdb_compiled() is not None:
-            # Advance time to generate a different backup name
-            self.master_node.setmocktime(self.master_node.getblockheader(self.master_node.getbestblockhash())['time'] + 100)
-            assert "failed" not in self.master_node.listwallets()
-            self.master_node.loadwallet("failed")
-            assert_raises_rpc_error(-4, "Failed to create database", self.master_node.migratewallet, "failed")
-            wallets = self.master_node.listwallets()
-            assert "failed" in wallets and all(wallet not in wallets for wallet in ["failed_watchonly", "failed_solvables"])
-
     def test_blank(self):
         self.log.info("Test that a blank wallet is migrated")
         wallet = self.create_legacy_wallet("blank", blank=True)