64638 Add sample code to DefaultTextStyleTransition (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

64639 Change LicensePage’s loading color from scaffoldBackgroundColor to cardColor (cla: yes, f: material design, framework, waiting for tree to go green)

64644 [flutter_tools] generates version.json for web using flutter tool (cla: yes, tool)

64678 Wrap PopupMenu with SafeArea to respect status bar (a: layout, a: quality, cla: yes, f: material design, framework, waiting for tree to go green)

64698 Added sample code to AnimatedAlign (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

64742 Remove FlutterApplication from app templates. (cla: yes, tool, waiting for tree to go green)