Fixes part of https://github.com/vercel/next.js/issues/34274
Navigating to `/` causes to redirect preflight request to a url of browser language like `/en`.
This PR fixes to add the locale prefix always so that the redirect does not happen anymore and middleware can get a correct locale.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`
## Documentation / Examples
- [ ] Make sure the linting passes by running `yarn lint`
To collect the requests starting from page load, we need to register event listeners before page loading (`page.goto` API invocation). By default webdriver will wait for hydration, so we need to register events inside `browser.loadPage` to ensure we can collect the requests before hydration is done.
### Changes
* Add `beforePageLoad` for next webdriver
* registry page `'request'` event before loading page
* update related tests for agruments change
### Usage
```js
browser = await webdriver(appPort, '/path', {
waitHydration, // default true
retryWaitHydration, // default false
disableCache, // default false
beforePageLoad, // default undefined
})
```
In PR #26968, we added Set of loaded images that was removed in #33474 erroneously.
We still need to track loaded images since we can't rely on `img.complete`, especially if the parent uses `react-virtualized`.
Tested on https://nextjs.org/showcase
