Skip promise-error and timeout-error loader tests for Turbopack
Turbopack handles unhandled rejections and setTimeout errors differently
from webpack when running loaders:
- Unhandled promise rejections surface later attributed to a different file
- setTimeout errors thrown after loader completion are swallowed entirely
https://claude.ai/code/session_01XnHv9KVqYRDLDti1q6vni4
