[native] Display pinned messages not present in Redux

Summary:
This is the same as D8096, but for native.

Depends on D8096

Test Plan:
Please see the before and after videos below

Before:

After:

Reviewers: atul, inka, ginsu

Reviewed By: inka

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8097