[web/native] improve rendering Tunnelbroker messages

Summary:
Fix warning about key.
Remove Heartbeat messages - this is spam, we have a flag saying whether socket is connected or not.

Depends on D11572

Test Plan: Test if messages are visible

Reviewers: bartek, marcin, tomek

Reviewed By: bartek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D11574