Dart CI

add `@useResult` annotation #2324

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Run time

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Job	Run time
dart_format	18s
dart_analyze	17s
dart_pana	55s
dart_test (macos-latest)	1m 11s
dart_test (ubuntu-latest)	1m 14s
dart_publish_dry_run	19s
dart_docs	31s
dart_test (windows-latest)	2m 7s
	6m 52s