Cleanup the unverified emails from the database

crates/storage-pg/migrations/20250115155255_cleanup_unverified_emails.sql

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+-- Copyright 2025 New Vector Ltd.
+--
+-- SPDX-License-Identifier: AGPL-3.0-only
+-- Please see LICENSE in the repository root for full details.
+
+-- This drops all the unverified email addresses from the database, as they are
+-- now always verified when they land in the user_emails table.
+-- We don't drop the `confirmed_at` column to allow rolling back
+
+-- First, truncate all the confirmation codes
+TRUNCATE TABLE email_confirmation_codes;
+
+-- Then, delete all the unverified email addresses
+DELETE FROM user_emails WHERE confirmed_at IS NULL;