72845 [NNBD] Migrate sample code pt 5 (cla: yes, framework, waiting for tree to go green)

72862 Fix type issue with RestorableNumN (and its subclasses) (cla: yes, framework)

72890 Remove deprecated Scaffold.resizeToAvoidBottomPadding (cla: yes, f: material design, framework, severe: API break, waiting for tree to go green)

72893 Remove deprecated WidgetsBinding.[deferFirstFrameReport, allowFirstFrameReport] (cla: yes, framework, severe: API break, waiting for tree to go green)

72895 DeferredComponent utility class for manual handling of Deferred Components (cla: yes, customer: money (g3), engine, framework, severe: new feature, waiting for tree to go green)