[iOS] Scroll view doesn't scroll when its height is explicitly set

### Description

I've identified a potential regression related to the simplified ScrollView on iOS (https://github.com/dotnet/maui/pull/26763). The issue occurs when an explicit HeightRequest is set on the ScrollView. In such cases, the content of the ScrollView is restricted to the specified height, which prevents scrolling as intended.

<video src="https://github.com/user-attachments/assets/17c17d3b-72f8-4d45-851b-3843c1c168d5"/>

```
<ScrollView HeightRequest="200" BackgroundColor="Blue">
        <VerticalStackLayout BackgroundColor="Yellow">
                <Label Text="Hello, world!"
                        HeightRequest="250"
                        BackgroundColor="Red"/>
                <Label Text="Hello, world2!"
                        BackgroundColor="Green"
                        HeightRequest="200"/>
        </VerticalStackLayout>
</ScrollView>
```


### Steps to Reproduce

_No response_

### Link to public reproduction project repository

_No response_

### Version with bug

9.0.21 SR2.1

### Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

### Last version that worked well

9.0.21 SR2.1

### Affected platforms

iOS

### Affected platform versions

_No response_

### Did you find any workaround?

_No response_

### Relevant log output

```shell

```

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[iOS] Scroll view doesn't scroll when its height is explicitly set #26900

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[iOS] Scroll view doesn't scroll when its height is explicitly set #26900

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Metadata

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