LibWeb: Add a test to ensure "resize" event on VV is fired on pinch-zoom

Author: https://github.com/kalenikaliaksandr
Commit: 0fbadba2e1
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6430
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/konradekk

Libraries/LibWeb/Internals/Internals.idl

@@ -33,6 +33,7 @@ interface Internals {
     undefined mouseDown(double x, double y);
     undefined movePointerTo(double x, double y);
     undefined wheel(double x, double y, double deltaX, double deltaY);
+    undefined pinch(double x, double y, double scaleDelta);
 
     boolean dispatchUserActivatedEvent(EventTarget target, Event event);
     undefined spoofCurrentURL(USVString url);