chore(clerk-js): Create UI Retheme Changes Reminder GitHub workflow

[anagstef]

Description

Add a GitHub Action to comment on any PR that changes files under the clerk-js/ui directory.

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:

Packages affected

• @clerk/backend
• @clerk/chrome-extension
• @clerk/clerk-js
• @clerk/clerk-expo
• @clerk/fastify
• gatsby-plugin-clerk
• @clerk/localizations
• @clerk/nextjs
• @clerk/clerk-react
• @clerk/remix
• @clerk/clerk-sdk-node
• @clerk/shared
• @clerk/themes
• @clerk/types
• build/tooling/chore

[changeset-bot]

🦋 Changeset detected

Latest commit: e0cee73

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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[github-actions]

⚠️ Changes detected under the ClerkJS ui directory!

Don't forget to apply the same changes under the /ui.retheme directory:
packages/clerk-js/src/ui/** ➡️ packages/clerk-js/src/ui.retheme/**

Also, you may need to update the following files:

• packages/localizations/src/en-US.retheme.ts
• packages/localizations/src/index.retheme.ts
• packages/types/src/appearance.retheme.ts
• packages/types/src/clerk.retheme.ts
• packages/types/src/index.retheme.ts
• packages/types/src/localization.retheme.ts

[dimkl]

❓ Can we use this only on branches with main base branch? In release/v4 there will never be a ui.retheme directory.