[services] Backup - Remove couts or replace them with glog

Summary:
Depends on D4588

Adding an initialization of the glog functionalities.
Removing std::couts or replacing them with glog functions for the backup service.

Test Plan:

cd services
yarn run-backup-service-in-sandbox

Builds ok

Reviewers: tomek, max

Reviewed By: tomek, max

Subscribers: ashoat, tomek, adrian, atul, abosh

Differential Revision: https://phab.comm.dev/D4589