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

[mmd]

> Maybe it's possible to reopen a note twice if the requests are done quick enough

At least checking the current status of a note (`Note.find_by_id(id)` ... `raise OSM::APINoteAlreadyOpenError.new(@note) unless @note.closed?`) is done without exclusive or optimistic locking (based on version numbers).

If multiple API requests for the same note are processed at the same time, such duplicates can occur.


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