Reverse order of Transmission Risk Levels used for Diagnosis Keys Upload (closes #678) (#679)

* Reverse order of the "Transmission Risk Levels" profile for Diagnosis Keys upload
Also added test for ProtoFormatConverterExtensions.kt

* Reverse order of the "Transmission Risk Levels" profile for Diagnosis Keys upload
Small adjustments: 1) Use compareByDescending instead of compareBy and asReversed();
2) leave the list for upload in a reversed chronological order, just like in the iOS app;
3) add sorting to the test to keep the desired values in the test readable in chronological order

Co-authored-by: Hee Tatt Ooi <hee.tatt.ooi@sap.com>
Co-authored-by: Jakob Möller <jakob.moeller@sap.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>