remove keyboard helper screen from web chat window

[amirmursal]

Fixes #4965

Changelog Entry

Fixes #4965. Removed keyboard helper screen in #5224, by @amirmursal

Description

Removed keyboard control screen from the chat window to address several accessibility issues

• [x] I have added tests and executed them locally
• [x] I have updated CHANGELOG.md
• [ ] I have updated documentation

Review Checklist

This section is for contributors to review your work.

• [ ] Accessibility reviewed (tab order, content readability, alt text, color contrast)
• [ ] Browser and platform compatibilities reviewed
• [ ] CSS styles reviewed (minimal rules, no z-index)
• [ ] Documents reviewed (docs, samples, live demo)
• [ ] Internationalization reviewed (strings, unit formatting)
• [ ] package.json and package-lock.json reviewed
• [ ] Security reviewed (no data URIs, check for nonce leak)
• [ ] Tests reviewed (coverage, legitimacy)