feat(backend): vitest

[jacekradko]

Description

Spiking out vitest test runner as a replacement for qunit in @clerk/backend

Related: https://linear.app/clerk/issue/SDKI-694/refactor-clerkbackend-to-use-vitest-instead-of-qunit

Checklist

• [ ] npm test runs as expected.
• [ ] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [ ] 🌟 New feature
• [ ] 🔨 Breaking change
• [ ] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 01e60b641ec16e23c8864ee02dafc9360968e3fb

The changes in this PR will be included in the next version bump.

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