80630 Migrate multiple_flutters to null safety (team, cla: yes, waiting for tree to go green)

80640 Migrate external_ui to null safety (team, cla: yes, waiting for tree to go green)

80641 Migrate channels to null safety (team, cla: yes, waiting for tree to go green)

80742 Fix the sample analyzer to analyze dart:ui and make the analyzer null safe (team, cla: yes, waiting for tree to go green)

80756 Migrate LogicalKeySet to SingleActivator (a: tests, a: text input, team, framework, f: material design, severe: API break, cla: yes, f: cupertino)

80763 Migrate gen_l10n to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)