Add license check #266

Job	Run time
mono_repo self validate	23s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	27s
analyze_and_format; Dart 2.19.0; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, ...	47s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	35s
unit_test; Dart 2.19.0; PKG: pkgs/firehose; `dart test`	35s
unit_test; Dart 2.19.0; PKG: pkgs/dart_flutter_team_lints; `dart test`	34s
unit_test; Dart dev; PKG: pkgs/corpus; `dart test`	52s
unit_test; Dart 2.19.0; PKG: pkgs/corpus; `dart test`	44s
unit_test; Dart dev; PKG: pkgs/dart_flutter_team_lints; `dart test`	40s
unit_test; Dart dev; PKG: pkgs/firehose; `dart test`	39s
analyze_format; Dart dev; PKG: pkgs/blast_repo; `dart format --output=none --set-exit-if-changed ...	23s
test; Dart dev; PKG: pkgs/blast_repo; `dart test --test-randomize-ordering-seed=random`	36s
	7m 15s

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