ExposureHistory - high risk by multiple low risk (EXPOSUREAPP-3515) #2397

* Adjusted risk logic

* Added tests for various risk states

* Location to location

* adjusted testcases

* Added option to test high risk due to low risk encounters

* enhanced encounter json

* Fix test take

* test without mockkstatic for oberservation

* tests....

* test ci observation

* fix for circle CI cannot mokkstatic

* adjusted test to work again

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