fix(ci): Add project flag and show errors in versioned docs aliasing (#11459)
## Summary
- Added `--project=turbo-site` flag to `vercel ls` command so it queries
the correct project
- Changed `2>/dev/null` to `2>&1 | tee /dev/stderr` so Vercel CLI errors
are visible in CI logs instead of being swallowed
This fixes an issue where the versioned docs aliasing step would fail
with a generic "No deployment found" error when the actual problem was
that the Vercel CLI needed a project specified.