fix: update Jinja for-loop test to expect nested MultipleResults format

The for-loop renders to 3 separate SQL statements, which correctly
produces nested result sets consistent with all other multi-statement
output in the CLI.

.... Generated with [Cortex Code](https://docs.snowflake.com/en/user-guide/cortex-code/cortex-code)

Co-Authored-By: Cortex Code <noreply@snowflake.com>

Author: 2 people

tests_integration/sql/test_sql_templating.py

@@ -134,4 +134,4 @@ def test_sql_jinja_for_loop_with_semicolons(runner, snowflake_session):
     )
 
     assert result.exit_code == 0
-    assert result.json == [{"0": 0}, {"1": 1}, {"2": 2}]
+    assert result.json == [[{"0": 0}], [{"1": 1}], [{"2": 2}]]