`ArgumentOutOfRangeException` in `OnDetachedFromLogicalTreeCore`

[TomEdwardsEnscape]

OnDetachedFromLogicalTreeCore enumerates children of the current control, but doesn't account for the collection of children changing during enumeration.

To Reproduce

1. Start Control Gallery
2. Switch to the TabControl tab
3. Enable "Set TabItem.ContentTemplate"
4. Close Control Gallery

System.ArgumentOutOfRangeException
  HResult=0x80131502
  Message=Index was out of range. Must be non-negative and less than the size of the collection. Arg_ParamName_Name
  Source=System.Private.CoreLib
  StackTrace:
   at System.ThrowHelper.ThrowArgumentOutOfRange_IndexException()
   at System.Collections.Generic.List`1.get_Item(Int32 index)
   at Avalonia.Collections.AvaloniaList`1.get_Item(Int32 index) in Avalonia\src\Avalonia.Base\Collections\AvaloniaList.cs:line 148
   at Avalonia.StyledElement.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e) in Avalonia\src\Avalonia.Base\StyledElement.cs:line 932
   at Avalonia.StyledElement.OnDetachedFromLogicalTreeCore(LogicalTreeAttachmentEventArgs e) in Avalonia\src\Avalonia.Base\StyledElement.cs:line 934
   ...

Expected behavior

OnDetachedFromLogicalTreeCore should account for the possibility of its children changing during enumeration.

Environment

• OS: N/A
• Avalonia-Version: 11.0.5

[erri120]

Similar to #14437.