[lib][web][native] Refactor usingOlmViaTunnelbrokerForDMs

Summary:
issue: ENG-9263
We want to allow thick threads for dev and staff

Test Plan: flow, tested that creating thick threads works on native

Reviewers: tomek, kamil

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13335