[native] Add 'go to sidebar' to tooltip

Summary: When sidebar was already created from message, tooltip should say "go to sidebar', and use existing threadInfo to navigate, instead of creating pending sidebar

Test Plan: Checked if creating tooltip is still possible like before, checked if text is changed if sidebar or promoted sub-thread exists. Tested if pressing 'go to sidebar' navigates to correct sidebar/thread

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: zrebcu411, Adrian, atul, subnub

Differential Revision: https://phabricator.ashoat.com/D663