[openstreetmap/openstreetmap-website] Disallow username changes to user_n if n isn't their id (PR #4218)

[Anton Khorev]

> Without it, there's a risk of soft deletes failing.

Wasn't [this report](https://github.com/openstreetmap/openstreetmap-website/security/advisories/GHSA-2779-44wq-qcm8) seen by anyone again, like [previously](https://github.com/openstreetmap/openstreetmap-website/issues/4362)?
Looks like they are only visible to [osm org members](https://github.com/orgs/openstreetmap/people?query=role%3Aowner) and @gravitystorm is not one of them.

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