Fix duplicate test removal error case handling (EXPOSUREAPP-7124) (#3115)

* Remove TransactionException.kt it is never being thrown, leftover from legacy code.

* On error, move to submission dispatcher screen, there the user could also be coming from a TAN.

* Refactor handling for errors that happen when the user tries to register the same test type again.

* Don't save a test that is already *_REDEMEED on the initial scan.

* Unit tests for RA/PCRCoronaTest.isFinal

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>