[services] Tests - run cargo fmt

Summary:
Depends on D4379
Something's wrong, cargo fmt should be fired up in git pre commit hooks, this should be fixed.

Test Plan: -

Reviewers: varun, ashoat

Reviewed By: varun, ashoat

Subscribers: varun, ashoat, palys-swm, Adrian, atul, yayabosh

Differential Revision: https://phab.comm.dev/D4413