[native] Remove all instances of LegacyThreadInfo from native
Summary:
Part of https://linear.app/comm/issue/ENG-6366/rename-minimallyencodedrawthreadinfo-to-rawthreadinfo
NOTE: Made a single change in lib to get this to pass CI.
Depends on D10675
Test Plan: flow
Reviewers: ashoat, ginsu, tomek
Reviewed By: tomek
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D10676