[services] Tests - Backup - Send log

Summary:
Depends on D4632

Adding a piece of test for "send log" functionality.

Test Plan:

cd services
yarn run-performance-tests backup 1

Reviewers: tomek, varun

Reviewed By: tomek, varun

Subscribers: ashoat, tomek, adrian, atul, abosh

Differential Revision: https://phab.comm.dev/D4633