[iOS/Windows] CollectionView HeaderTemplate and FooterTemplate don't appear to work

[PureWeen]

Description

The tests added to this PR fail on windows and iOS
#22889

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

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!

Open similar issues:

• CollectionView Header and Footer not shown in Windows (#21224), similarity score: 0.72
• [regression/8.0.3] Grid in CollectionView HeaderTemplate takes the whole page in iOS (#18886), similarity score: 0.70

Closed similar issues:

• [Windows]CollectionView not show Header and Footer (#17499), similarity score: 0.73
• CollectionView Header & Footer not showing (#14557), similarity score: 0.72

Note: You can give me feedback by thumbs upping or thumbs downing this comment.