Turbopack: add benchmark for JS analysis (#83042)
```
full/full/packages/next/dist/compiled/babel-packages/packages-bundle.js
time: [176.60 ms 177.59 ms 178.86 ms]
Found 5 outliers among 100 measurements (5.00%)
2 (2.00%) high mild
3 (3.00%) high severe
full/full/node_modules/.pnpm/react-dom@19.2.0-canary-03fda05d-20250820_react@19.2.0-canary-03fda05d-...
time: [65.679 ms 66.265 ms 67.000 ms]
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
2 (2.00%) high mild
3 (3.00%) high severe
```
