Enable backup creation and upload for SIWE users from JS
Summary: This differential enalbes backup upload for SIWE users.
Test Plan:
- Log in as SIWE user.
- Tap upload backup button.
- Ensure it succeeds and that there is an entry with full backup message in the dynamodb.
Reviewers: kamil, bartek
Reviewed By: kamil
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D11716