[lib] Remove logout / delete account / identity login logic from specific reducers

Summary:
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

Test Plan: Tested that it's possible to log out and back in, and no errors show up. Tested that on logout success state is still cleared

Reviewers: michal, kamil, ginsu

Reviewed By: ginsu

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10868