[lib] Refactor report store reducer

Summary:
issue: https://linear.app/comm/issue/ENG-5813/refactor-report-store-ops
We send reports to the report store, not the keyservers. So I will remove them on identity login / logout, not on keyserver login / logout / setNewSession.
Identity will be handled in ENG-6424

Test Plan: Tested that reports are stll removed on logout

Reviewers: michal, kamil, ginsu

Reviewed By: michal, ginsu

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10619