Testing Pyramid

[pierremtb]

Specific coverage type for specific needs, including:

1. XState unit tests
2. Lib unit tests
3. Component tests

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Milestone: https://github.com/KittyCAD/modeling-app/milestone/9

[pierremtb]

This is more like an area of work rather than a well scoped initiative, so closing for now.

Some work on moving a lot of playwright test cases to vitest is happening for modeling codemods as part of #7434