test: use default import for fs-extra

[sapphi-red]

Description

This PR fixes this CI fail.
https://github.com/vitejs/vite/actions/runs/3811060325/jobs/6483511814
This fail is caused by vitest-dev/vitest#2512, a breaking change in vitest 0.26.0. (Because we now use vitest 0.25.x the test is passing.)
This test was relying on an invalid named exports. This PR changes that part to use the default export.

#11419 seems not to work even with this PR. I guess it's microsoft/playwright#19661.

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[sapphi-red]

Ah, no, github actions is working correctly.

The "Build&Test" jobs are not running because #11294 splitted the CI into two jobs.
Maybe we need to change the required jobs or make "Build&Test" job itself run but skip the actual tests running.

[ArnaudBarre]

Oh sorry didn't account for required jobs when splitting the CI.

The doc for this case is here but that's so bad...

I only see two others solutions: removing require check or removing path filtering (which is useful for this kind of small PR)

Edit: Third solution: #11548