refactor(tests): remove unused TestPerformance class from schema resolver tests

api/tests/unit_tests/core/schemas/test_resolver.py

         assert resolved[1] == {"type": "string"}
         assert resolved[2]["type"] == "object"
         assert resolved[2]["title"] == "Q&A Structure Schema"
-
-
-class TestPerformance:
-    """Performance-related tests"""
     
     def test_cache_performance(self):
         """Test that caching improves performance"""

spec.http

+GET /console/api/spec/schema-definitions
+Host: cloud-rag.dify.dev
+authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoiNzExMDZhYTQtZWJlMC00NGMzLWI4NWYtMWQ4Mjc5ZTExOGZmIiwiZXhwIjoxNzU2MTkyNDE4LCJpc3MiOiJDTE9VRCIsInN1YiI6IkNvbnNvbGUgQVBJIFBhc3Nwb3J0In0.Yx_TMdWVXCp5YEoQ8WR90lRhHHKggxAQvEl5RUnkZuc
+###