[.NET MAUI] Updated samples using `ListView` and `CollectionView` with `DataTemplate`

[duffh]

Description

A .NET MAUI bug is preventing CollectionView and ListView content displaying in release configuration if the data type is not explicitly set on the DataTemplate.

This workaround didn't work for the Picker used in "Offline routing" so I replaced it with a CollectionView.

https://github.com/dotnet/maui/issues/20002

Type of change

• Bug fix

Platforms tested on

• [ ] WPF .NET 8
• [ ] WPF Framework
• [ ] WinUI
• [x] MAUI WinUI
• [x] MAUI Android
• [ ] MAUI iOS
• [ ] MAUI MacCatalyst

Checklist

• [x] Self-review of changes
• [x] All changes work as expected on all affected platforms
• [x] There are no warnings related to changes
• [x] Code is commented and follows .NET conventions and standards
• [x] Codemaid and XAML styler extensions have been run on every changed file
• [x] No unrelated changes have been made to any other code or project files
• [x] Screenshots are correct size and display in description tab (800 x 600 on Windows, MAUI mobile platforms use the MAUI Windows screenshot)