Merge branch 'release/1.8.x' into feature/3456-enfv2-main-branch

.circleci/config.yml

...oronawarnapp/test/debugoptions/ui/DebugOptionsFragment.kt

...app/test/debugoptions/ui/DebugOptionsFragmentViewModel.kt

...i/coronawarnapp/test/debugoptions/ui/DebugOptionsState.kt

...eviceForTesters/res/layout/fragment_test_debugoptions.xml

...c/main/java/de/rki/coronawarnapp/CoronaWarnApplication.kt

...p/src/main/java/de/rki/coronawarnapp/storage/LocalData.kt

...rc/main/java/de/rki/coronawarnapp/util/WatchdogService.kt

.../java/de/rki/coronawarnapp/worker/BackgroundWorkHelper.kt

...va/de/rki/coronawarnapp/worker/BackgroundWorkScheduler.kt

...oronawarnapp/worker/DiagnosisKeyRetrievalOneTimeWorker.kt

...ronawarnapp/worker/DiagnosisKeyRetrievalPeriodicWorker.kt

...napp/worker/DiagnosisTestResultRetrievalPeriodicWorker.kt

Corona-Warn-App/src/main/res/values/strings.xml