[Services] Clang fixes for services/lib/src
Summary:
Clang is a bit more pedantic. Make it happy.
Occurred to me that this was never an existing workflow.
So I made it into another diff.
Allows for D4489 to be built from a MacOS device
Test Plan: Follow nix test plan from D4489 on a mac device
Reviewers: atul, karol, max
Reviewed By: atul
Subscribers: ashoat, tomek, adrian, abosh
Differential Revision: https://phab.comm.dev/D4761