Migrate test cases from WhatToEat app

[CathyZhu0110]

Description of Change

1. Migrate the test cases from WhatToEat to ManualTest app.
2. Add L3 test case to verify issue [iOS 26] Navigation hangs after rapidly open and closing new page using Navigation.PushAsync #32425

[dotnet-policy-service]

Hey there @@CathyZhu0110! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull request overview

This pull request migrates test cases from the WhatToEat sample app to the ManualTests app and adds a new L3 test case to verify issue #32425. The migration includes comprehensive manual test coverage for CarouselView and ScrollView controls, along with additional bug fix verification tests.

Changes:

• Added two new test categories: CarouselView (M1-M4) and ScrollView (N1-N4) with supporting ViewModels
• Migrated 8 complete test cases covering layout, resize/rotate, navigation, and search functionality
• Added 2 bug fix test cases (L2 and L3) for TabBar switching and Navigation.PushAsync issues
• Created supporting pages (MonkeyDetailPage, AddMonkeyPage) for test functionality

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
Category.cs	Adds CarouselView and ScrollView category constants
CategoryViewModel.cs	Adds CategoryViewModel classes for CarouselView and ScrollView categories
M1_Layout.xaml/.cs	CarouselView basic layout test with horizontal swiping
M2_ResizeRotate.xaml/.cs	CarouselView resize and rotation behavior test
M3_Navigation.xaml/.cs	CarouselView navigation to detail page test
M4_AddDelete.xaml/.cs	CarouselView add/delete item functionality test
AddMonkeyPage.xaml/.cs	Supporting page for adding new monkey entries
MonkeyDetailPage (CarouselView)	Detail page with optional delete functionality
N1_Layout.xaml/.cs	ScrollView basic layout with 2-column grid test
N2_ResizeRotate.xaml/.cs	ScrollView resize and rotation behavior test
N3_Navigation.xaml/.cs	ScrollView navigation to detail page test
N4_SearchBar.xaml/.cs	ScrollView with SearchBar filtering test
MonkeyDetailPage (ScrollView)	Detail page without delete functionality
L2_TabBarSwitching.xaml/.cs	Bug fix test for TabBar switching issue #32900
L3_Navigation.PushAsync.xaml/.cs	Bug fix test for Navigation.PushAsync issue #32425