[WinUI][CollectionView2]Drag and Drop and CanMixGroups support was not available

[SuthiYuvaraj]

Description

Drag and drop functionality and CanMixGroups support that were available in CV1 are not included in the current implementation. This results in missing interaction and grouping capabilities compared to CV1.

Steps to Reproduce

1. Run the attached sample
2. Ensure the CollectionView has UseWindowsCollectionView2Handler configured
3. Perform the drag and drop action

Expected Behavior
The CollectionView should support both drag and drop functionality and CanMixGroups behavior similar to CV1.
Actual Behavior
Both drag and drop functionality and CanMixGroups support are not available in the current implementation.

Link to public reproduction project repository

https://github.com/dotnet/maui/tree/main/src/Controls/samples/Controls.Sample/Pages/Controls/CollectionViewGalleries/ReorderingGalleries

Version with bug

11.0.0-preview2

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[Ahamed-Ali]

This issue has been validated in Visual Studio 18.4.1 in BugFixes_WinUI_CV2 branch . It can be reproducible on Windows platform.