Add a note to the Ghost User that it was generated by the system
From a user in ZD: https://gitlab.zendesk.com/agent/tickets/78224
I would like to add an admin note to the "Ghost User" account that was created during the upgrade to v9.1 (so that our other admins can quickly see that it is a system-generated account). However, since the webapp does an error check on the form, it won't let me update the user because "firstname.lastname@example.org" is an invalid e-mail address.
Also, just some feedback, I recommend adding a default admin note to the ghost user account, something like "System-generated user account created with upgrade to GitLab v9.0--serves as a container for records (issues, merge requests, notes, etc...) associated with deleted users"