68908 Remove nullOk from Scaffold.of and ScaffoldMessenger.of, create maybeOf for both (cla: yes, f: material design, framework, waiting for tree to go green)

68917 Remove nullOk parameter from Focus.of, FocusTraversalOrder.of, and FocusTraversalGroup.of (cla: yes, f: material design, framework)

68918 Adaptive TextField (cla: yes, f: material design, framework, waiting for tree to go green)

68922 Make Theme.of non-nullable (cla: yes, f: material design, framework, waiting for tree to go green)

68987 Added none property in a DismissDirection (cla: yes, f: material design, framework, team, waiting for tree to go green)