Use cmake function 'kdbusaddons_generate_dbus_service_file' from kdbusaddons...

Use cmake function 'kdbusaddons_generate_dbus_service_file' from kdbusaddons to generate dbus service file

Summary:
BUG:382460
FIXED-IN:5.43.0

Test Plan:
compiled against installed build from kdbusaddons git repo master branch

Reviewers: dfaure, bcooksley, apol

Reviewed By: dfaure

Subscribers: kfunk, vonreth, #windows, apol, #frameworks

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D9424