[lib] Narrow canToggleMessagePin and useCanToggleMessagePin types

Summary:
To make it clear which should be used in which scenario (RawThreadInfo vs ThreadInfo).

Depends on D11820

Test Plan: flow + close reading

Reviewers: ashoat, ginsu, tomek, varun

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D11822