a50711f4f417c0d596c79b38070c8ff0da54aba2
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.
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