[native] switch all thread avatars to use ThreadAvatar component instead of Avatar

Summary:
Now that we have ThreadAvatar we should render that for thread avatars instead of Avatar

Depends on D7262

Test Plan: Tested that all the thread avatars are still able to be rendered correctly for all three avatar types (emoji, image, and ens)

Reviewers: ashoat, atul

Reviewed By: ashoat

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D7263