[native] [refactor] [ENG-991] use usePromoteSidebar hook

Summary:
use hook in native, remove old code
https://linear.app/comm/issue/ENG-991/promote-sidebar-to-subthread-on-web

Test Plan: use promote thread feature like you normally would.

Reviewers: atul, def-au1t, palys-swm

Reviewed By: palys-swm

Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3748