[native] [feature] [ENG-1016] add alert prompt to user, promote thread cant be undone
Summary:
add alert to let user know this action can't be undone
https://linear.app/comm/issue/ENG-1016/add-prompt-to-user-that-sidebar-promotion-cant-be-undone
Test Plan: go to promote thread, click cancel, click yes. Functionality should work as expected.
Reviewers: atul, palys-swm, yayabosh, def-au1t
Reviewed By: palys-swm
Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga, yayabosh
Differential Revision: https://phabricator.ashoat.com/D3755