test(forms): add unit tests for FormTextarea and FormSelect components

- Add comprehensive test coverage for FormTextarea and FormSelect components to validate rendering, accessibility, props forwarding, error handling, and behavior.
- Introduced function-scoped fixtures in e2e tests to ensure test isolation and address event loop issues with pytest-asyncio and SQLAlchemy.

backend/tests/e2e/conftest.py

@@ -368,3 +368,9 @@ async def e2e_org_with_members(e2e_client, e2e_superuser):
             "user_id": member_id,
         },
     }
+
+
+# NOTE: Class-scoped fixtures for E2E tests were attempted but have fundamental
+# issues with pytest-asyncio + SQLAlchemy/asyncpg event loop management.
+# The function-scoped fixtures above provide proper test isolation.
+# Performance optimization would require significant infrastructure changes.