[services] Backup - Add DB test for Backup
Summary:
Adding test for database operations on BackupItems
Depends on D3160
Test Plan:
cd services yarn test-backup-service
Reviewers: palys-swm, geekbrother, varun, ashoat, jimpo
Reviewed By: palys-swm, ashoat
Subscribers: benschac, ashoat, palys-swm, Adrian, atul
Differential Revision: https://phabricator.ashoat.com/D3161