fix: move imports to top of test_rest.py to resolve ruff E402 errors

Remove duplicate `import json` and `import pytest` added mid-file for
issue #3422 tests; move `import json` to the top-level import block.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

tests/catalog/test_rest.py

@@ -18,6 +18,7 @@
 from __future__ import annotations
 
 import base64
+import json
 import os
 from collections.abc import Callable
 from typing import Any, cast
@@ -3167,10 +3168,6 @@ def test_load_table_without_storage_credentials(
 # Tests for issue #3422: REST catalog auth cannot be configured via environment
 # variables unless auth JSON strings are decoded.
 
-import json
-
-import pytest
-
 
 @pytest.mark.parametrize(
     "auth_dict, expected_header, mocker_type",
@@ -3290,9 +3287,6 @@ def test_rest_catalog_with_basic_auth_flat_properties(rest_mock: Mocker) -> None
     assert rest_mock.last_request.headers["Authorization"] == expected_auth_header
 
 
-import pytest
-
-
 @pytest.mark.parametrize(
     "catalog_properties, token_response, expected_scopes",
     [