[lib][native] Remove displayFailureAlert prop from *EditUserAvatarProvider
Summary:
As of D8341 we no longer use or need this prop. Surfacing of errors is handled by platform-specific code for consistency.
Now we just need to get rid of useUploadSelectedMedia and we can consolidate NativeEditUserAvatarProvider, WebEditUserAvatarProvider, and BaseEditUserAvatarProvider into a single platform-agnostic EditUserAvatarProvider.
Depends on D8341
Test Plan: NA/flow/eslint
Reviewers: ashoat, ginsu, rohan
Reviewed By: ashoat
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D8342