test: add support for vitest

[joshblack]

Adds a proof-of-concept for Vite support in Primer React. This PR adds vitest support and targets specific tests to demonstrate what it would be like working with vitest, both using JSDOM and vitest's browser mode.

[changeset-bot]

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Latest commit: b052adc

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	106.03 KB (0%)
packages/react/dist/browser.umd.js	106.29 KB (0%)