Convert UI demos from using radio to select

[rebeccaalpert]

Convert demos on https://www.patternfly.org/patternfly-ai/chatbot/ui page from using Radios to a Select.

[Mash707]

@rebeccaalpert I'll work on this, could you assign this to me. Thank You

[github-actions]

🎉 This issue has been resolved in version 6.3.0-prerelease.14 🎉

The release is available on:

• GitHub release
• npm package (@prerelease dist-tag)

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