test(integration): use DETACH DELETE in label cleanup for consistency

Aligns test_get_labels_returns_list cleanup with the rest of the suite.
DETACH DELETE is safe even if the node gains relationships in future tests.

Author: polaz

tests/integration/test_sdk.py

@@ -224,7 +224,7 @@ def test_get_labels_returns_list(client):
         names = [lbl.name for lbl in labels]
         assert label_name in names, f"{label_name} not in {names}"
     finally:
-        client.cypher(f"MATCH (n:{label_name} {{tag: $tag}}) DELETE n", params={"tag": tag})
+        client.cypher(f"MATCH (n:{label_name} {{tag: $tag}}) DETACH DELETE n", params={"tag": tag})
 
 
 def test_get_labels_has_property_definitions(client):