Extend corona test data structures with digital covid certificate related...

Extend corona test data structures with digital covid certificate related properties (EXPOSUREAPP-7487) (#3309)

* Extend corona test data structures with digital covid certificate related properties.
+Some additional wiring, plumbing and tests for future PRs.

* LINTs

* Adjust TestRegistrationRequest to supply dcc consent and DOB on test registration.

* Remove explicit assignment, defaults are sufficient.

* A few additional unit tests to check defaults.

Co-authored-by: Mohamed Metwalli <mohamed.metwalli@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>