Part of https://linear.app/comm/issue/ENG-6366/rename-minimallyencodedrawthreadinfo-to-rawthreadinfo
Unlike [Raw]ThreadInfo, we will be able to completely remove LegacyResolvedThreadInfo since it's a "UI type" and isn't persisted anywhere or anything.
Did this via WebStorm "Inline alias" refactor tool.
Depends on D10654