Use ProjectService for linting

[jakebailey]

This simplifies things, and lets us dogfood the experience.

$  hyperfine -w 3 -n 'before' -p 'git switch main' 'node ./node_modules/eslint/bin/eslint.js .' -n 'after' -p 'git switch eslint-project-service' 'node ./node_modules/eslint/bin/eslint.js .'
Benchmark 1: before
  Time (mean ± σ):     26.980 s ±  0.523 s    [User: 42.924 s, System: 1.743 s]
  Range (min … max):   26.235 s … 28.133 s    10 runs

Benchmark 2: after
  Time (mean ± σ):     27.924 s ±  0.322 s    [User: 44.788 s, System: 1.784 s]
  Range (min … max):   27.451 s … 28.619 s    10 runs

Summary
  'before' ran
    1.04 ± 0.02 times faster than 'after'

Slower, but we also have technically enabled typed linting on a handful of new files?

[DanielRosenwasser]

Slower, but we also have technically enabled typed linting on a handful of new files?

What would a more apples-to-apples comparison look like with the same rules?

[jakebailey]

I would just ignore the three root files altogether, then compare before and after.

But, those files are small, so I would think the culprit here is actually #59335.