[openstreetmap/openstreetmap-website] Refactor notes to use Hotwire (Issue #6495)

[Pablo Brasero]

pablobm created an issue (openstreetmap/openstreetmap-website#6495)

Currently, the UI for map notes is built with a JS widget that accesses the API directly.

This is difficult to maintain, as it deviates from Rails conventions and requires a higher grade of JS skills in addition to the default Rails skills. It also creates issues where some app errors are not translated (see https://github.com/openstreetmap/openstreetmap-website/issues/6367) or errors coming from elsewhere in the infrastructure are rendered badly (see https://github.com/openstreetmap/openstreetmap-website/issues/6422).

This issue proposes that the notes UI is refactored to use Hotwire, which would address these issues.

Ideally this would be done in several steps rather than a single big PR. On first approach, it looks like the code to add note comments (`app/assets/javascripts/index/note.js`) can be refactored separately from the code to create comments (`app/assets/javascripts/index/new_note.js`). Therefore these could be two separate PRs. Other PRs could be added to provide refactors along the way, if appropriate.
### Potential conflicts
The following open PRs intend to make changes to the data model for notes. Therefore they might create conflicts with PRs derived from this issue:
- https://github.com/openstreetmap/openstreetmap-website/pull/5815
- https://github.com/openstreetmap/openstreetmap-website/pull/5904


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