[native] Use expo-file-system uploads

Summary:
This diff replaces react-native-background-upload to expo-file-system upload utilities.

Depends on D9151.

Test Plan:

1. Check if uploads work properly for unencrypted images:

1a. Check if image is uploaded when app is moved to background
1b. Check if image upload is canceled when abortHandler is executed

2. Check above steps for encrypted images.

Reviewers: bartek, atul

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9152