Remove leftovers from the old email verification system

crates/storage-pg/migrations/20260108120030_remove_user_emails_old_confirmation.sql

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+-- Copyright 2026 Element Creations Ltd.
+--
+-- SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+-- Please see LICENSE in the repository root for full details.
+
+-- We reworked how email verification works in
+-- https://github.com/element-hq/matrix-authentication-service/pull/3784
+-- but kept some old schema around to allow rolling back. We're safe to drop
+-- those now
+
+-- Users don't have a 'primary email' anymore
+ALTER TABLE users DROP COLUMN primary_user_email_id;
+
+-- Replaced by user_email_authentications
+DROP TABLE user_email_confirmation_codes;
+
+-- User emails are always confirmed when they are in this table now
+ALTER TABLE user_emails DROP COLUMN confirmed_at;