28743 Set MinimumOSVersion in iOS Info.plist based on buildroot setting (platform-ios, cla: yes, waiting for tree to go green, platform-macos, embedder)

28783 Set MinimumOSVersion to iOS 9 in Info.plist (platform-ios, cla: yes, waiting for tree to go green)

28846 Fixes FlutterSemanticsScrollView to not implement accessibility conta… (platform-ios, cla: yes, needs tests)

28868 [iOSTextInput] remove floating cursor asserts (platform-ios, cla: yes, waiting for tree to go green)

28884 Make FlutterEngineGroup support initialRoute (platform-ios, platform-android, cla: yes)

28894 Destroy overlay surfaces when the rasterizer is torn down (platform-ios, platform-android, cla: yes, waiting for tree to go green, platform-fuchsia)