[keyserver][lib][native][web] Remove lastCommunicatedPlatformDetails form redux top level

Summary:
issue: https://linear.app/comm/issue/ENG-4462/refactor-lastcommunicatedplatformdetails-field
The last step is to remove lastCommunicatedPlatformDetails from top level of redux store

Test Plan: ran yarn flow-all. Checked that both migrations work.

Reviewers: michal, kamil

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9078