[openstreetmap/openstreetmap-website] Add changeset upload modifiers (#1389)

[mmd]

Ahem, the multi fetch doesn't abort in that case, it simply returns the element with a "visible=false" tag. Only in case you provide an object id that never existed on the database, you will get an HTTP 404. I believe for the use case of a reverter tool, that should never happen, right?

https://upload.apis.dev.openstreetmap.org/api/0.6/relations?relations=1396

https://upload.apis.dev.openstreetmap.org/relation/1396

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