[openstreetmap/openstreetmap-website] Add a primary key to the changeset_tags table (PR #4279)

[Tom Hughes]

This seems to be the only table that doesn't actually have a primary key defined in the database for some reason, instead we just lie to rails about it's existence.

It also improves our monkey patched primary key support for migrations to allow concurrent builds of primary keys and fix removal of primary keys which it seems has never worked.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4279

-- Commit Summary --

  * Improve support for primary keys in migrations
  * Add a primary key to the changeset_tags table

-- File Changes --

    M config/initializers/migrate.rb (42)
    A db/migrate/20231007141103_add_primary_key_to_changeset_tags.rb (13)
    M db/structure.sql (16)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4279.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4279.diff

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