[TASK] Add backend routes to configuration module

This patch add the backend routes to the configuration module, to show all
current active backend routes.

Resolves: #74164
Releases: master, 7.6
Change-Id: I5c191d1d8dc8b002ea1a66a33b6628f7eec9994c
Reviewed-on: https://review.typo3.org/47048


Reviewed-by: Daniel Maier <dani-maier@gmx.de>
Tested-by: Daniel Maier <dani-maier@gmx.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>