78922 Migrate flutter_tool net.dart to null safety (a: null-safety, cla: yes, team, tool)

78923 Migrate android_console to null safety (a: null-safety, cla: yes, team, tool)

78928 change all dynamic slot to Object type (cla: yes, f: cupertino, f: material design, framework)

78932 Migrate error_handling_io to null safety (a: null-safety, cla: yes, team, tool)

78933 Fix hit testing in PointerSignalResolver sample (cla: yes, framework)

78934 Migrate deferred_components_validator to null safety (a: null-safety, cla: yes, team, tool)