refactor: run tests with node:test

[bradenmacdonald]

This PR demonstrates changing a few tests to run using Node's Test Runner instead of jest.

Running the tests with Node's native test runner is much faster than running them with Jest, but does not support some of the non-standard imports we're currently using like importing SCSS and SVG files into Paragon. I've tried getting them to work using things like @nodejs-loaders/media to support importing SVG files, and that does work but it conflicts with the tsx loader that we need to support TSX/JSX syntax. So I'm not sure we can use this approach to testing without major refactoring.

It also doesn't support Jest test syntax so many test cases have to be changed, although in a systematic way. (e.g. expect(tree).toMatchSnapshot(); -> t.assert.snapshot(tree);). This is a big disadvantage compared to Vitest.

Time taken to run npm test -- src/Button/Button*.test.tsx:

	Time with coverage	Time (no cov)
node:test	4.76s	3.29s
Vitest	5.48s	4.16s
Jest	41.80s	10.40s

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