Revert connction field refactor
Summary:
issue: https://linear.app/comm/issue/ENG-4809/logout-triggered-on-app-restart
since my conncetion field refactor, namely since D8924, restaring the app trigges logout. I couldn't find a quick solution, so here is a diff reverting that whole stack
Code in persist.js is the only code not generated by git revert
Test Plan: tested that after the migration the conncetion field is back at the top level and not in keyserverStore. tested tha the app can be run
Reviewers: michal, kamil, tomek
Reviewed By: tomek
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D8950