Fix PopupTo Backstack issue (EXPOSUREAPP-4123) (#1813)

* Fix PopupTo Backstack issue

* Popup to nav_graph for all actions leaving a submission flow fragment with destination home screen.

* clean up navigation graph

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: chilja <chiljamgossow@gmail.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>