[openstreetmap/openstreetmap-website] Switch user images to use Active Storage (#2296)

[mmd]

We're currently discussing this on Slack, as it seems to affect some apps out there.

Previously, http://localhost:3000/api/0.6/user/1 returned absolute urls, e.g. `<img href="http://localhost:3000/attachments/users/images/000/000/001/large/4...`, while the new code only returns relative urls `"<img href="/rails/active_storage/representations/eyJfcmFpbHMi`.

Some apps create some funny urls based on that information, which point to their own domain, rather than osm.org -> image lookup fails.

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