refactor: Migrate Demo Search to use FluentAutocomplete

[Hona]

Pull Request

📖 Description

This refactors away from Listbox -> autocomplete which is keyboard navigable.

I had to make some changes & bug fixes to the autocomplete, however this results in API changes - keen for feedback before I keep going

🎫 Issues

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• [ ] I have added tests for my changes.
• [ ] I have tested my changes.
• [ ] I have updated the project documentation to reflect my changes.
• [ ] I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• [ ] I have added a new component
• [ ] I have added Unit Tests for my new compontent
• [ ] I have modified an existing component
• [ ] I have validate Unit Tests for an existing component

⏭ Next Steps

[Hona]

I've got some unit tests to write - however the rest should be good to go

[Hona]

Sorry - been a bit busy. Going to find some time to write these tests :)