Matan Lurey a50711f4f4 Enable header_guard_check (and --fix) in ci/format (flutter/engine#50102)
Closes https://github.com/flutter/flutter/issues/133415.

This includes a performance optimization for the runner itself, where
`--include=...`s are used as a base to check, versus checking _every_
file and seeing if it exists in a list. This works better with what is
expected in `ci/bin/format.dart` without any contract change.

Also added a few more functional tests of the system.
2024-01-26 16:32:14 -08:00
..