Automated notification on expiration of registrar portal certificate

[vohmar]

Notification to the user about approaching expiration date of portal certificates

In focus are the Registrar certificates

Interface = REGISTRAR

and their validation date

Valid to = 2026-01-31 14:37:00 UTC

The default time to expire for sending out the reminder should be 1 month (this should possibly be configurable)

The notification should be sent to the registrar contact email (users do not have email addresses in the registry)