adjust vitest ambient declaration file according to vitest docs

[vorant94]

What:

Changed the way of patching vitest types with jest-dom custom matchers

Why:

The current approach uses @vitest/expect module, which is considered to be internal implementation details by the vitest team according to comments here, so it shouldn't be used to accomplish the goal

How:

New approach follows the latest official vitest documentation. There was also docs fix that I proposed and got approved recently, so the vitest docs website itself isn't reflecting the latest state. To verify that new approach is aligned with docs, you can check this PR

Along the way I removed export {} statement since it isn't needed when there are import statements are present in the same file

Checklist:

• Documentation N/A
• Tests N/A
• Updated Type Definitions
• Ready to be merged

[gnapse]

@all-contributors please add @vorant94 for code

[allcontributors]

@gnapse

I've put up a pull request to add @vorant94! 🎉

[github-actions]

🎉 This PR is included in version 6.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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