Linux clang-tidy shards reverted in flutter/engine#42434 because it was retrying the costly validations and hiding the errors as timeouts.

e.g.
https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20mac_clang_tidy/867/overview
https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20Engine%20Drone/210269/overview