**Backport:** https://codeberg.org/forgejo/forgejo/pulls/7683
- The OAuthCallback code that is responsible for creating a new user, if one does not exist yet, did not use `[service].ALLOW_ONLY_EXTERNAL_REGISTRATION` as default value for the restricted field of a user.
- Resolvesforgejo/forgejo#7681
- Add integration test.
Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7688
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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