All of the CollectionView samples need to be updated so the CV is inside a Grid not a StackLayout

[PureWeen]

https://github.com/dotnet/maui-samples/blob/main/8.0/UserInterface/Views/CollectionViewDemos/CollectionViewDemos/Views/Swipe/VerticalListSwipeContextItemsPage.xaml#L7

StackLayouts will cause the CollectionView to take up infinite space. What this means is that the CV won't be virtualized at all. if a CV has 100 items it'll render 100 items which is really bad for performance