Switch from Jest to Vitest

[connor-baer]

Purpose

Jest's abysmal support for ESM blocks the upgrade to Prettier v3 (#912). Switching to Vitest magically solves these issues and simplifies the codebase.

Approach and changes

• Uninstall Jest and install Vitest
• Migrate the test files to Vitest's API

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests

[changeset-bot]

⚠️ No Changeset found

Latest commit: fc7a5fc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (638b4ed) 68.26% compared to head (0720cc0) 63.45%.

❗ Current head 0720cc0 differs from pull request most recent head fc7a5fc. Consider uploading reports for the commit fc7a5fc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #913      +/-   ##
==========================================
- Coverage   68.26%   63.45%   -4.82%     
==========================================
  Files          18       26       +8     
  Lines         375     1970    +1595     
  Branches       64       95      +31     
==========================================
+ Hits          256     1250     +994     
- Misses        110      712     +602     
+ Partials        9        8       -1     

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