Remove unused imports from test files

- Remove unused 'patch' import from extensions test
- Remove unused 'CascadeConfiguration' import from data test
- Remove unused 'result' variable assignment

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: tpellissier

tests/unit/data/test_relationships.py

@@ -13,7 +13,6 @@
     ManyToManyRelationshipMetadata,
     Label,
     LocalizedLabel,
-    CascadeConfiguration,
 )
 
 

tests/unit/extensions/test_relationships.py

@@ -4,7 +4,7 @@
 """Tests for relationship extension helpers."""
 
 import unittest
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock
 
 from PowerPlatform.Dataverse.extensions.relationships import create_lookup_field
 from PowerPlatform.Dataverse.models.metadata import (
@@ -29,7 +29,7 @@ def setUp(self):
 
     def test_basic_lookup_field_creation(self):
         """Test basic lookup field creation with minimal parameters."""
-        result = create_lookup_field(
+        create_lookup_field(
             self.mock_client,
             referencing_table="new_order",
             lookup_field_name="new_AccountId",