fix: Add `allowComments` and `allowTrailingCommas` to turbo.json schema (#11579)
## Summary
Adds `allowComments` and `allowTrailingCommas` properties to the
turbo.json schema to prevent VSCode warnings when using JSONC features.
Fixes #11566
## Problem
When formatting `turbo.jsonc` with tools like `oxfmt` or `prettier` that
add trailing commas, VSCode shows warnings like "Trailing comma
jsonc(519)" because the schema doesn't declare support for JSONC
features.
## Solution
Added two lines to `packages/turbo-types/schemas/schema.json`:
```json
"allowComments": true,
"allowTrailingCommas": true,
```
## Test plan
- [ ] Open a `turbo.jsonc` file with trailing commas in VSCode
- [ ] Verify no "Trailing comma" warnings appear
🤖 Generated with [Claude Code](https://claude.ai/code)
---------
Co-authored-by: ddmoney420 <ddmoney420@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Anthony Shew <anthonyshew@gmail.com>