chore(nextjs,clerk-react,clerk-js): Drop the mounted variant of UserVerification

[panteliselef]

Description

Drop the experimental mounted variant of UserVerification.

Removes:

• <__experimental_UserVerification/>
• __experimental_mountUserVerification()
• __experimental_unmountUserVerification()

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: 45a8134

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

This PR includes changesets to release 18 packages

Name	Type
@clerk/clerk-js	Minor
@clerk/nextjs	Minor
@clerk/clerk-react	Minor
@clerk/types	Minor
@clerk/chrome-extension	Patch
@clerk/clerk-expo	Patch
@clerk/elements	Patch
@clerk/remix	Patch
@clerk/tanstack-start	Patch
@clerk/astro	Patch
@clerk/backend	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/localizations	Patch
@clerk/clerk-sdk-node	Patch
@clerk/shared	Patch
@clerk/testing	Patch
@clerk/themes	Patch

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