Extend PPA Exposure Risk Metadata with PT (EXPOSUREAPP-6722) (#3275)

* Added Pt metadata to ExposureRiskMetadataDonor

* Added Pt metadata to AnalyticsKeySubmissionDonor

* Added Pt metadata to TestResultDonor

* Fixed ppa unit tests

* linting

* Revert "Added Pt metadata to TestResultDonor"

This reverts commit 1edced45a2d7fa2f2db866472d2ea4cd40dbde65.

* Revert "Added Pt metadata to AnalyticsKeySubmissionDonor"

This reverts commit c45c977c3001fe32dc20d9cbf77b58f665ad5fe0.

* Reverted unit tests that are not for ExposureRiskMetadataDonor

* Some more minor changes to ExposureRiskMetadataDonor to adress comments

* Removed more unused code

* linting

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Chilja Gossow <49635654+chiljamgossow@users.noreply.github.com>