feat(map-and-label): remove individual features

[jessicamcinchak]

Rebased version of #3595

My changes (builds on 3595 description):

• [x] Remove feature from map
• [x] Shift labels on "remove" so they stay incremental
• [x] Ensure previously working handleSubmit & "back"/"change" navigation still works
  • This is honestly still a bit wonky but I think less vital for UR than that actual "remove" functionality !!
  • See #3612 for original implementation, which isn't ideal in combo with new GeoJSONChange hook here

Open questions:

• When removing a feature, I'm forcing a re-render of the web component by changing a key prop on its' parent container which does cause a visible flash - is this acceptable? Other less hacky feeling ideas?
  • Tried many other variations but was having a hard time getting the web component to re-render based on changing features alone - I think this is most likely due to Lit's "shallow change detection"
  • Spent some time reading up on Lit Events, but not totally clear to me if an event listener would be another way to solve this?

[github-actions[bot]]

Removed vultr server and associated DNS entries

[jessicamcinchak]

Thanks @DafyddLlyr for thorough review here - merging to staging for UR deadline, but will open follow PRs today to address these comments / fix-forward !