Prevent test replacement if new test is already redeemed (EXPOSUREAPP-7447) (#3439)

* Shouldn't be possible but if there are multiple tests for a type, the test test fragment should still show them.

* Introduce common test registration state processor for each screen that needs to handle test registration in the submission flow.

* Fix instrumentation tests.

* Fix lint issues

* Additional unit tests and improved docs.

* Fix dialog edge-case behavior (normal flow / test replacement)

* Refactoring

* Use TestRegistrationRequest for navigation to remove need for null checks.

* Fix build issues.

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