Check license header in `flutter analyze` #2298

Job	Run time
test / test-dart-vm (stable)	2m 37s
test / test-dart-vm (3.9.0)	3m 5s
dart2js_test / test-dart-2js (3.9.0, chrome)	7m 5s
ddc_test / test-dart-ddc (stable, chrome)	5m 39s
ddc_test / test-dart-ddc (stable, firefox)	4m 13s
ddc_test / test-dart-ddc (3.9.0, firefox)	4m 18s
native_test / test-dart-native (macos-14)	2m 0s
native_test / test-dart-native (windows-latest)	8m 16s
ddc_test / test-dart-ddc (3.9.0, chrome)	3m 53s
dart2js_test / test-dart-2js (stable, chrome)	6m 31s
dart2js_test / test-dart-2js (stable, firefox)	6m 22s
dart2js_test / test-dart-2js (3.9.0, firefox)	7m 20s
	1h 1m 19s

Provide feedback