[lib] Check for previous auth message and websocket connection state in identity search context provider

Summary:
This closes the identity search websocket connection if there is a null or changed auth message and the socket is still active.

Depends on D10938

Test Plan: flow and ran on web

Reviewers: varun, bartek, kamil, ashoat

Reviewed By: bartek, ashoat

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10973