Jean-François Greffier a15fe50e7b
feat(test runner): workers as percentage (#17400)
Allows to set workers as a percentage of logical CPUs, for example
"50%".

Examples :
```bash
npx playwright test --workers 3
npx playwright test --workers 50%
```

```js
const config: PlaywrightTestConfig = {
  // ...
  workers: '33%',
}
```
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