28937 Cherry-pick #28846 and #28743 into flutter-2.6-candidate.11 (platform-ios, platform-android, cla: yes, needs tests, embedder)

28971 [iOS] Hardware keyboard text editing shortcuts (platform-ios, cla: yes)

29108 [iOS] Using UIView container as text input superview for textinput plugin (platform-ios, cla: yes, waiting for tree to go green, needs tests)

29113 [iOS] Fix duplicated keys when typing quickly on HW keyboard (platform-ios, cla: yes)

29127 [iOS] Fixes key press related memory leaks (platform-ios, cla: yes, needs tests)

29131 Calculate the frame target time based on targetTimestamp in VsyncWaiterIOS (platform-ios, cla: yes, needs tests)