71868 Doc fixes for dry layout (cla: yes, framework)

71872 Make FocusManager configurable in BuildOwner (cla: yes, framework)

71879 Add DynamicFeature system channel (cla: yes, engine, framework, platform-android)

71880 Constrain width/hight when asking child for intrinsics (cla: yes, framework)

71899 let NOTICES be double gzip wrapped to reduce on-disk installed space (cla: yes, framework, team, tool)

71940 Remove duplicate code in Element.rebuild() and BuildOwner.buildScope() (cla: yes, framework)

71944 app bar leading back button should not change if the route is popped (cla: yes, f: material design, framework, waiting for tree to go green)