Delete country list cache (EXPOSUREAPP-3154) (#1431)

* Refactored DataRetentionHelper class to use injection

* Added ViewModel to SettingsReset

* Add a clear cache method to AppConfigProvider.kt

* Fixed repository live data containing stale data after app reset.

* Moved logic from fragment to view model.

* Adjusted tests to accommodate AppConfigProvider changes

* Reverted back last 2 commits and downgraded ktlint plugin

* Fixed DI issue

* Put the scope in the hands of the VM

* Deleted unused imports

* Removed unused imports from VM

* Use injected dispatcher provider to simplify testing.

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: AlexanderAlferov <64849422+AlexanderAlferov@users.noreply.github.com>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>