70382 Update FlexibleSpaceBar dartpad sample (adopt a widget, cla: yes, d: api docs, d: examples, documentation, f: material design, framework, waiting for tree to go green)

71050 Add dartpad sample for AnimatedPadding (adopt a widget, cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

71093 AdoptAWidget: ColorFiltered (adopt a widget, cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

71174 AdoptAWidget: PageView (cla: yes, d: api docs, d: examples, documentation, framework)

71378 [FloatingActionButtonLocation] Add proper formatting to documentation (cla: yes, d: api docs, f: material design, framework, waiting for tree to go green)