Feature: #103147 - Provide full userdata in password recovery email in ext:backend 

See forge#103147

Description 

A new array variable {userData} has been added to the password recovery FluidEmail object. It contains the values of all fields from the be_users table belonging to the affected backend user.

Impact 

It is now possible to use the {userData} variable in the password recovery FluidEmail to access data from the affected backend user.