Support new lines in <RichText> component

[frandiox]

Fixes this usecase: #2144 (comment)

It now creates a React fragment with the string and a <br> for each new line in a text node.

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset.
If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG.
If you are making simple updates to examples or documentation, you do not need to add a changeset.

[shopify]

Oxygen deployed a preview of your fd-richtext-newlines branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM
subscriptions	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM
vite	✅ Successful (Logs)	Preview deployment	Inspect deployment	June 5, 2024 2:14 PM

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[blittle]

Added a test. Thx for fixing it!