[MAUI] I2_Spacing - The horizontal spacing should be changed but it is actually changed vertically

[QianaJiao]

Description

Affected case: I2: Horizontal List (ItemSpacing)

Steps to Reproduce

1. Deploy https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests to Windows.
2. Navigate to 'I CollectionView' ->'I2_Spacing'
3. Open Horizontal List Page
4. Enter a value and update the space

Actual Behavior: The horizontal spacing should be changed but it is actually changed vertically.

Link to public reproduction project repository

https://devdiv.visualstudio.com/Pkgs/_git/VS.TestAssets.Xaml?path=/Assets/Projects/ManualMauiTests

Version with bug

Microsoft.Maui.Controls 8.0.70-ci.net8.24325.2

Is this a regression from previous behavior?

Not a regression, The issue also repro on 8.0.61& 8.0.3

Affected platforms

Windows

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Open similar issues:

• [MAUI] I2_Spacing - Updating the vertical and horizontal spacing, the layout of the second column will change (#23305), similarity score: 0.89
• [Android] Crash updating the ItemSpacing at runtime (#22187), similarity score: 0.79

Closed similar issues:

• [MAUI] I2_Spacing - Changing the vertical and horizontal spacing values, images and location are truncated (#23310), similarity score: 0.86
• [Windows] CollectionView ItemSpacing is not working (#4112), similarity score: 0.79
• CollectionView with ItemSpacing => Infinite layout loop Android (#21379), similarity score: 0.77

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