run example jest & vitest in next-yak CI

[jantimon]

fixes #56

• [x] jest in example
• [x] vitest in example

this is how yak works if no compiler is used:

styled.button`color:red`; is syntactic sugar for styled.button(["color:red"])

therefore styled.button`color:red`; will render <button className="">

right now there is a bug when using constants:

const color = "blue";
const Button = styled.button`color:${blue};`;

as this is is syntactic sugar for styled.button(["color:", ";"], "blue") which will render <button className="blue">

but I believe this PR is still okay for a first round and we should try to fix the issue above in a follow up e.g. with an early return in styled if the first arg is an array

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #124 will not alter performance

_{Comparing feature/jest-tests (d92f60b) with main (8eea888)}

Summary

✅ 2 untouched benchmarks