fix: ignore Playwright test results directory

[benmccann]

Description

Vite watches everything in the test directory. Playwright can write a lot of changes if tracing is enabled.

I'd rather make everyone put their source code in a src directory or something rather than watch the entire root directory except for ignored directories, but this might be the best we can do until Vite 4 unless we want to make more breaking changes.

Additional context

This killed the SvelteKit tests and was extremely difficult to track down. There's probably a fair number of projects using both Vite and Playwright including Vite itself of course.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

Maybe this was the reason for some of the flackiness in our tests?

[bluwy]

I think this is good for now, but long term we should implement something like #8341 (as you've commented there also)