convert search box and results to functional component

[zoran995]

What this PR does

Fixes: #7518

This is needed for mobx-react upgrade as part of an upgrade to react 18.

Test me

Verify that search box and results for the same as on main:

• search results are properly renderer and click on search results
• clearing search box closes the search results panel
• clearing the search box removes the marker from the map

Checklist

• There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• [ ] I've updated relevant documentation in doc/.
• I've updated CHANGES.md with what I changed.
• I've provided instructions in the PR description on how to test this PR.