Fix issues with TEK submission flow (EXPOSUREAPP-4189, EXPOSUREAPP-4215) (#1840)

* Draft:
Split up test result fragment into pending and negative.

* TODO pending fragment needs to forward automatically when the result is available
* When do we check if tracing is enabled?

* When we receive a non-pending test result while on the pending-result fragment, we forward automatically to the right screen.

* Clean up pending test result layout.

* Extract invalid test result fragment into it's own screen.

* LINTs

* Remove unused problematic API.

* Fix merge regressions.

* Address PR comments: Improve navigation.