Fix test result notifications and handle unexpected testresults (EXPOSUREAPP-6715) (#2972)

* Prevent invalid test result values (mixing up PCR/RA)

* Don't cancel the test result notification, if it has not been viewed.

* Don't throw exceptions on invalid test results, but map them to test specific INVALID state.
This is especially crucial during test registration, as we don't want to waste the QR Code.

* Remove unused code from merge.

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