9022 Fix horizontal scroll direction for macOS (cla: yes)

9023 Forward custom IDE flags to GN. (cla: yes)

9025 Correct the return type of addRetained (cla: yes)

9026 Initialize next_pointer_flow_id_ to 0 (cla: yes)

9033 Avoid unnecessary copying of vectors in AccessibilityBridge (cla: yes)

9034 Expose pointer type and buttons in embedder.h (cla: yes)

9036 Fix dartdevc build (cla: yes)

9039 Update FlutterDevCompilerTarget for the new superclass constructor in the Dart SDK (cla: yes)

9041 TextStyle.height property as a multiple of font size instead of multiple of ascent+descent+leading. (affects: text input, cla: yes, prod: API break)