fix: rollback when AnalyticDB create zhparser failed (#24260)

Co-authored-by: xiaozeyu <xiaozeyu.xzy@alibaba-inc.com>

api/core/rag/datasource/vdb/analyticdb/analyticdb_vector_sql.py

             conn.close()
         self.pool = self._create_connection_pool()
         with self._get_cursor() as cur:
+            conn = cur.connection
             try:
                 cur.execute("CREATE EXTENSION IF NOT EXISTS zhparser;")
             except Exception as e:
+                conn.rollback()
                 raise RuntimeError(
                     "Failed to create zhparser extension. Please ensure it is available in your AnalyticDB."
                 ) from e
                 cur.execute("CREATE TEXT SEARCH CONFIGURATION zh_cn (PARSER = zhparser)")
                 cur.execute("ALTER TEXT SEARCH CONFIGURATION zh_cn ADD MAPPING FOR n,v,a,i,e,l,x WITH simple")
             except Exception as e:
+                conn.rollback()
                 if "already exists" not in str(e):
                     raise e
             cur.execute(