Progress info is currently broken when creating archives using
CreateJob. This happens e.g. when the user creates an archive
through the KFileItemAction in Dolphin.
This is caused by CreateJob using a nested AddJob and the percent
signal of the AddJob was not forwarded to CreateJob.

It was encessary to use QOverload since KJob has both a signal and a
member function called percent.

BUG: 382599
FIXED-IN: 19.04.0
Differential Revision: D19953