[openstreetmap/openstreetmap-website] Disallowing the creation of duplicate notes (#1929)

[hashtagdeamon]

Top 20 open duplicates which are not from maps.me:
[540985](https://osm.org/note/540985)
[540995](https://osm.org/note/540995)
[936047](https://osm.org/note/936047)
[937205](https://osm.org/note/937205)
[1175542](https://osm.org/note/1175542)
[729936](https://osm.org/note/729936)
[500717](https://osm.org/note/500717)
[571763](https://osm.org/note/571763)
[754249](https://osm.org/note/754249)
[754267](https://osm.org/note/754267)
[754247](https://osm.org/note/754247)
[754265](https://osm.org/note/754265)
[754245](https://osm.org/note/754245)
[754263](https://osm.org/note/754263)
[754244](https://osm.org/note/754244)
[754262](https://osm.org/note/754262)
[754243](https://osm.org/note/754243)
[754261](https://osm.org/note/754261)
[754242](https://osm.org/note/754242)
[754260](https://osm.org/note/754260)
...

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