Feature: #99584 - Allow to provide name for new admin users in ext:install
See forge#99584
Description
The field real has been added to the "Create Administrative User" modal
in ext:install, so it is possible to provide the name of a new admin user.
The notice in the header of the model has been removed, since it is superfluous now.
Impact
It is now possible to provide the field real, when a new admin user
is created in ext:install.