Context: https://linear.app/comm/issue/ENG-6366/rename-minimallyencodedrawthreadinfo-to-rawthreadinfo
RawThreadInfo was an alias for LegacyRawThreadInfo|MinimallyEncodedRawThreadInfo, but we want to remove it. As a first step we expand all usages of RawThreadInfo to LegacyRawThreadInfo|MinimallyEncodedRawThreadInfo.
Depends on D10624