Remove unused shutil import from test_tools.py

Co-authored-by: bact <128572+bact@users.noreply.github.com>

Author: Copilot

tests/core/test_tools.py

@@ -3,7 +3,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 import os
-import shutil
 import tempfile
 import unittest