issue: ENG-6424
Removing logic handling logout and delete account actions from specific reducers, because now we are removing all this state in one place using resetUserSpecificStateOnIdentityActions (see D10860)
I didn't remove logic from the following reducers:
- reduceCurrentUserInfo, because these actions set a new currentUserInfo
- reduceReportStore, because we set some special values to enabledReports on those actions
- reduceKeyserverStore, baceuse we have to handle Ashoat's keyserver in a special way