fix(2fa-backupcodes): Don't remember disabled and deleted users over …

[nickvergessen]

• Resolves: #

Summary

• fix(backupcodes): Remove old notifications before creating a new remi… #41447 already improved the situation on our server, but a lot of permanently disabled and deleted users still have a background job and (for disabled users) receive a new notification every second week.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)