Refactor error_response function for improved argument handling

- Enhanced the `error_response` function to support backward compatibility by normalizing arguments when positional arguments are misused.
- Updated various views to pass `None` for the `errors` parameter in `error_response` calls, ensuring consistent response formatting.
- Adjusted logging in `ContentSyncService` and `WordPressClient` to use debug level for expected 401 errors, improving log clarity.
- Removed deprecated fields from serializers and views, streamlining content management processes.

backend/igny8_core/modules/planner/serializers.py

@@ -185,8 +185,8 @@ class ContentIdeasSerializer(serializers.ModelSerializer):
             'id',
             'idea_title',
             'description',
-            'content_structure',
-            'content_type',
+            'site_entity_type',
+            'cluster_role',
             'target_keywords',
             'keyword_cluster_id',
             'keyword_cluster_name',