fix(checkbox-group): fixed checkbox scroll issue

[ridvandmrc]

💡 What is the current behavior?

When using a scrollable list of checkboxes in combination with ix-content, after scrolling and checking a checkbox that is at the bottom of the list, the content jumps up.

GitHub Issue Number: #1308

🆕 What is the new behavior?

• the input that was used as place holder hide the input

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• [ ] 🦮 Accessibility (a11y) features were implemented
• [X] 🗺️ Internationalization (i18n) - no hard coded strings
• [X] 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• [ ] 📄 Documentation was reviewed/updated (pnpm run docs)
• [ ] 🧪 Unit tests were added/updated and pass (pnpm test)
• [ ] 📸 Visual regression tests were added/updated and pass (Guide)
• [ ] 🧐 Static code analysis passes (pnpm lint)
• [ ] 🏗️ Successful compilation (pnpm build, changes pushed)

👨‍💻 Help & support