FIX: No PPA submission in background over 36+ hours (EXPOSUREAPP-5286) #2430

* Moved analytics worker scheduling to MainActivity from CoronaWarnApplication to make sure scheduling also happens on first app launch
Removed the inital 24 Hours start delay offset from the DataDonationAnalyticsScheduler, a random delay between 0 and 24 Hours is still generated

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Fixed MainActivityTest for instrumentation runs

Signed-off-by: Kolya Opahle <k.opahle@sap.com>

* Removed invalid logging from DataDonationAnalyticsScheduler

* Removed Timber import from DataDonationAnalyticsScheduler

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