Implement paintsChild on RenderObjects that skip painting on their children by @dnfield in https://github.com/flutter/flutter/pull/103768

[web] do not swallow WebDriver errors by @yjbanov in https://github.com/flutter/flutter/pull/103754

add noSuchMethod to _MulticastCanvas to unblock smoke testing against forthcoming new getTransform/Clip methods by @flar in https://github.com/flutter/flutter/pull/103737

Add VoidCallbackAction and VoidCallbackIntent by @gspencergoog in https://github.com/flutter/flutter/pull/103518

Add a mechanism to observe layer tree composition. by @dnfield in https://github.com/flutter/flutter/pull/103378

More missing clipBehavior respects by @dnfield in https://github.com/flutter/flutter/pull/103931