feat(vitest): allow per-file and per-worker fixtures

[sheremet-va]

Description

Closes #6157

Test plan:

1. the file fixture is provided as a primitive value and is accessible by tests
2. the file fixture is provided as a factory and is initialised once in all suites, teardown is called once
3. the file fixture is provided as a factory and is initialised once per file when isolation is disabled, teardown is called once per file
4. the worker fixture is provided as a primitive and is accessible by tests
5. the worker fixture is provided as a factory and is initialised once in all suites, teardown is called once by default
6. the worker fixture is provided as a factory and initialised once per worker when isolation is disabled, teardown is called once per file in threads
7. the worker fixture is provided as a factory and initialised once per file when isolation is disabled in vmThreads, teardown is called by the same rules
8. worker fixture cannot import from the file or test fixture except static
9. file fixture cannot import from test fixture except static
10. file fixture with auto is initialised always on the first test
11. worker fixture with auto is initialised always on the first test
12. file and worker fixtures are available in beforeEach and afterEach

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[netlify]

✅ Deploy Preview for vitest-dev ready!

Name	Link
🔨 Latest commit	f903811
🔍 Latest deploy log	https://app.netlify.com/projects/vitest-dev/deploys/683ac16e8a96d00008cd4b2c
😎 Deploy Preview	https://deploy-preview-7704--vitest-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[sheremet-va]

@AriPerkkio can you help me with the worker teardown? I cannot make it work at all. beforeExit is not called, and calling cleanup before recycleWorkers kills Vitest process 🤔

[AriPerkkio]

beforeExit is not called, and calling cleanup before recycleWorkers kills Vitest process 🤔

Is there a test that can be used to reproduce this?

[sheremet-va]

beforeExit is not called, and calling cleanup before recycleWorkers kills Vitest process 🤔

Is there a test that can be used to reproduce this?

Here is a test file:

https://github.com/vitest-dev/vitest/blob/2cc955786cb5f14530314849d894849de83364b6/test/cli/test/scoped-fixtures.test.ts

test.skip are for worker scoped tests. There is also a TODO // TODO: worker teardown is not called