test/topology_custom: add copyright/license blurb to tests

Most tests were missing this, fix it.

test/topology_custom/test_different_group0_ids.py

@@ -1,3 +1,9 @@
+#
+# Copyright (C) 2023-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+
 from test.pylib.manager_client import ManagerClient
 
 import asyncio

test/topology_custom/test_old_ip_notification_repro.py

@@ -1,3 +1,9 @@
+#
+# Copyright (C) 2023-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+
 import logging
 import time
 import pytest

test/topology_custom/test_select_from_mutation_fragments.py

@@ -1,3 +1,10 @@
+#
+# Copyright (C) 2023-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# This file configures pytest for all tests in this directory, and also
+
 import pytest
 
 from cassandra.protocol import InvalidRequest  # type: ignore

test/topology_custom/test_shutdown_hang.py

@@ -1,3 +1,9 @@
+#
+# Copyright (C) 2023-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+
 import asyncio
 import logging
 import time