add noSuchMethod to _MulticastCanvas to unblock smoke testing against...

add noSuchMethod to _MulticastCanvas to unblock smoke testing against forthcoming new getTransform/Clip methods (#103737)

packages/flutter/lib/src/widgets/widget_inspector.dart

@@ -285,6 +285,11 @@ class _MulticastCanvas implements Canvas {
     _main.translate(dx, dy);
     _screenshot.translate(dx, dy);
   }
+
+  @override
+  dynamic noSuchMethod(Invocation invocation) {
+    super.noSuchMethod(invocation);
+  }
 }
 
 Rect _calculateSubtreeBoundsHelper(RenderObject object, Matrix4 transform) {