Resolve notifications warning in when running tests

[warning] Missed 1 notifications in action Iterup.Accounts.UserToken.store_confirmation_changes.

This happens when the resources are in a transaction, and you did not pass
`return_notifications?: true`. If you are in a changeset hook, you can
return the notifications. If not, you can send the notifications using
`Ash.Notifier.notify/1` once your resources are out of a transaction.