[openstreetmap/openstreetmap-website] Validation for note transitions (Issue #4528)

[Tom Hughes]

There is a check for duplicate closes (https://github.com/openstreetmap/openstreetmap-website/blob/master/app/controllers/api/notes_controller.rb#L181) and has been since ae27f7adbe561b20203fa639ac1aa50d0408edc0 in February 2013 but as it is at the application layer two closes very close together might still make it to the database because both might pass the check before either one has made the change as the check is not inside a transaction and there is no constraint in the database that would block it.

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