Fix local end user session grants and schema resolution

scenarios/06-rag-vector-classified-docs/sql/04_test_queries.sql

@@ -1,6 +1,8 @@
 SET PAGESIZE 100
 SET LINESIZE 220
 
+ALTER SESSION SET CURRENT_SCHEMA = ADMIN;
+
 PROMPT RAG retrieval simulation: retrieve chunks closest to the question embedding.
 
 SELECT chunk_id,
@@ -12,4 +14,3 @@ SELECT chunk_id,
 FROM dds_rag_chunks
 ORDER BY distance
 FETCH FIRST 5 ROWS ONLY;
-