[lib] Narrow ClientFullStateSync to MinimallyEncodedRawThreadInfos
Summary:
Similar to D10606 and D10608, this will allow us to remove invariant from D10588.
Depends on D10608
Test Plan: NA, flow
Reviewers: ashoat, ginsu, tomek
Reviewed By: ashoat
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D10609