Introduce skeleton classes for UI tests and screenshots (EXPOSUREAPP-2997) (#1496)

* Initial refactoring on the Submission flow.
Trimming down SubmissionViewModel.kt

* Refactored submission tan, and began instrumentation tests. Intro, Dispatcher and Tan complete

* Adapted instrumentation tests after merge - added ToDos

* Completed boilerplate submission instrumentation tests. Verification and screenshots to follow

* Fix lints

* More lint issues.

* Fix instrumentation test dependency missmatch.

* Move screenshot related permissions into a debug AndroidManifest.xml,
such that they don't get included in production builds.

* Added missing new line to manifest

Co-authored-by: Oliver Zimmerman <oezimmerman@gmail.com>
Co-authored-by: Kolya Opahle <k.opahle@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>