Geocoder click to trigger search event

[Patsnoop]

Description

I added a command to make clicking on a suggestion and pressing the enter key react the same

Issue number and link

Fixes #6313 - GeocoderViewModel.search command not executed when user clicks a suggestion - https://github.com/CesiumGS/cesium/issues/6313

Testing plan

I ran the program locally and tested the changes on my machine

Author checklist

• [X] I have submitted a Contributor License Agreement
• [X] I have added my name to CONTRIBUTORS.md
• [X] I have updated CHANGES.md with a short summary of my change
• [X] I have added or updated unit tests to ensure consistent code coverage
• [X] I have updated the inline documentation, and included code examples where relevant
• [X] I have performed a self-review of my code

[github-actions[bot]]

Thank you for the pull request, @Patsnoop!

:white_check_mark: We can confirm we have a CLA on file for you.

[ggetz]

@Patsnoop Do you have interest in getting this PR over the finish line?

[Patsnoop]

@ggetz Good Afternoon, I do plan on finishing this up. I will make some time this weekend to work on it and resubmit.

[ggetz]

Awesome, thanks @Patsnoop!

[ggetz]

@Patsnoop I'm going to close this PR for now to keep things tidy.

Please feel free to re-submit the PR when ready! Thanks!