65274 Add sample code for CupertinoActionSheet (cla: yes, f: cupertino, framework)

65313 Bug fix where MouseScrollWheel zoom in flutter-web does not execute onInteraction functions (cla: yes, framework, waiting for tree to go green)

65320 Add onSelectionChanged into SelectableText widget (cla: yes, f: material design, framework, waiting for tree to go green)

65323 Sliver padding overlap fix (a: quality, cla: yes, f: scrolling, framework, waiting for tree to go green)

65418 [flutter_tools] handle terminals that do not support single char mode in Terminal.promptForCharInput (cla: yes, tool)

65422 [flutter_tools] only lock if an upgrade/download will be performed (linux/macos) and output building messages to stderr (cla: yes, team, tool)