CollectionView Header and Footer leak memory on iOS

[EGoverde]

Description

Content placed in a CollectionView.Header or CollectionView.Footer does not get garbage collected on iOS. This is not happening on Android or WinUI. Tested using nightly '8.0.60-ci.net8.24304.1'.

The non-nightly version MAUI 8 has more memory-related issues with CollectionView that have been partially resolved in the nightly (see https://github.com/dotnet/maui/issues/20710), but this one still remains.

I created a demo project using MemoryToolkit.Maui.

Steps to Reproduce

1. Create a Page with a CollectionView in XAML.
2. Define a CollectionView.Header or CollectionView.Footer with any XAML (like a Label).
3. Navigate to and then away from the Page.
4. The content inside the Header or Footer does not get finalized.

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` ### Link to public reproduction project repository https://github.com/EGoverde/MemoryLeaks ### Version with bug Nightly / CI build (Please specify exact version) ### Is this a regression from previous behavior? Yes, this used to work in Xamarin.Forms ### Last version that worked well Unknown/Other ### Affected platforms iOS ### Affected platform versions _No response_ ### Did you find any workaround? _No response_ ### Relevant log output _No response_

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Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it. Thank you!

Closed similar issues:

• CollectionView is not currently being Garbage Collected (2) (#21249), similarity score: 0.86
• Android CollectionView leaks if given a header or footer (#16961), similarity score: 0.85
• [net7.0 / net8.0] [iOS] Memory leak when the CollectionView uses CollectionChanged and when adding a CollectionView to a Page makes it and the entire page live forever (#14654), similarity score: 0.81
• [net7.0 / net8.0] [iOS] Memory leak when CollectionView.ItemsSource changes (#14664), similarity score: 0.80
• CollectionView is not currently being Garbage Collected (#20710), similarity score: 0.79

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[RoiChen001]

Can repro this issue at iOS platform on the latest 17.11.0 Preview 2.0(8.0.60-ci.net8.24304.1&8.0.60-ci.net8.24303.1).