[lib] Clear connection issue on successful login

Summary:
After successful auth we can conclude that a connection issue no longer exists

https://linear.app/comm/issue/ENG-6027/reset-connectionissue-field

Depends on D10842

Test Plan: Log out, dispatch an action that sets a connection issue, log in - the connection issue should be cleared.

Reviewers: varun, inka, kamil

Reviewed By: inka

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D10843