chore(elements): Add more unit tests

[LekoArts]

Description

• Move existing tests into __tests__ folders
• Add unit tests for the router and two hooks
• Add more URL helpers to @clerk/shared so that our router can use them

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: fb04517

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@clerk/shared	Minor
@clerk/backend	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-js	Patch
@clerk/clerk-expo	Patch
@clerk/fastify	Patch
@clerk/nextjs	Patch
@clerk/clerk-react	Patch
@clerk/remix	Patch
@clerk/clerk-sdk-node	Patch
gatsby-plugin-clerk	Patch

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[LekoArts]

publint started to fail for unrelated reasons so this is a workaround to not make it fail the whole CI