[openstreetmap/openstreetmap-website] Require user names to be unique after unicode normalisation (PR #4405)

[Tom Hughes]

As with the previous checks on case sensitivity this only affects new users, and changes to names of existing users.

Once this is merged and deployed we can drop the old lowercase index in a separate change.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4405

-- Commit Summary --

  * Require user names to be unique after unicode normalisation

-- File Changes --

    M app/models/user.rb (17)
    A app/validators/normalized_uniqueness_validator.rb (18)
    A db/migrate/20231213182102_add_canonical_user_index.rb (7)
    M db/structure.sql (8)
    M test/models/user_test.rb (11)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4405.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4405.diff

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