test: don't share cacheDir among different configs

[sapphi-red]

Description

The test was sometimes failing with dep optimizer related errors. I guess this is caused by sharing cacheDir among different configs since we run tests with different configs parallelly.

Maybe we can include the config file path in cacheDir automatically in Vite 5?

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[bluwy]

Maybe we can include the config file path in cacheDir automatically in Vite 5?

There would still be an issue when calling Vite through the API though, maybe the optimizer metadata hash could be used to key it 🤔 (Actually that makes invalidation hard too.)

[patak-dev]

As a rule, you can't run two Vite processes with the same cache dir at the same time. And the cache dir can be also changed when using the JS API, no?
We may be seeing more issues because we changed the delete-rename scheme for dep optimization in main, #12622 could hide these issues again.

[sapphi-red]

Umm, that's a good point.