chore: remove missing turbow.js references (#10893)
### Description
Replace `node turbow.js` with direct `turbo` invocations in root
scripts:
- `package.json` referenced `turbow.js` in `turbo`/`turbo-prebuilt`
scripts.
- No `turbow.js` exists in the repository (full–repo search confirmed).
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
