In Testing Recipes, change to use root.unmount() and createRoot.

[yosipy]

fix: #4911

unmountComponentAtNode is used on Testing Recipes.
https://reactjs.org/docs/testing-recipes.html

However, unmountComponentAtNode(container) has been changed to root.unmount() in react 18.
It also shows to use createRoot.

I have updated the testing-recipes according to the upgrade-guide.
https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html

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Size Changes

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