Summary: As far as I can tell, we don't use trailing return types anywhere in our code base, so it seems silly to get a clang-tidy warning on almost every function definition.

Test Plan: N/A

Reviewers: #engineering, philkuz, zasgar, vihang

Reviewed By: #engineering, philkuz, vihang

Differential Revision: https://phab.corp.pixielabs.ai/D7812

GitOrigin-RevId: c7445287aa472e2ffb4f7b3a0b746099be171986