[native][web] use tunnelbroker for online status of thick threaded entries instead of keyserver

Summary:
Entry online status shouldn't be decided by keyserver for thick threaded entries. We're changing it to use tunnelbroker status instead

Depends on D13349

Test Plan: console logged on native. Will figure out how to test this on web

Reviewers: marcin, ashoat, tomek

Reviewed By: tomek

Differential Revision: https://phab.comm.dev/D13350