[lib] Inline reduceLastCommunicatedPlatformDetails

Summary:
issue: https://linear.app/comm/issue/ENG-5353/inline-reducelastcommunicatedplatformdetails
updateLastCommunicatedPlatformDetailsActionType is dispatched from socket and callServerEndpoint. In both of these we are in the context of one keyserver, so this action is keyserver specific

Test Plan: called updateLastCommunicatedPlatformDetailsActionType, checked that it sets the lastCommunicatedPlatformDetails correctly, chcecked that logInActionTypes sets it correctly.

Reviewers: michal, kamil, ginsu

Reviewed By: michal

Subscribers: varun, ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9764