[Android] Set FillViewport to true to MauiHorizontalScrollView

[kubaflo]

Issues Fixed

Fixes #25462
Fixes #25655

<VerticalStackLayout>
        <ScrollView Orientation="Horizontal"
                        Grid.Row="0"
                        HeightRequest="120"
                        HorizontalOptions="Fill"
                        BackgroundColor="Green">
                <HorizontalStackLayout
                        HorizontalOptions="Fill"
                        BackgroundColor="Pink">
                        <Label Text="Hello"/>
                </HorizontalStackLayout>
        </ScrollView>

        <ScrollView Grid.Row="2"
                        VerticalOptions="Fill"
                        Orientation="Vertical"
                        BackgroundColor="Green"
                        HorizontalOptions="Fill">
                <StackLayout HorizontalOptions="Fill"
                                VerticalOptions="Center"
                                BackgroundColor="Red">
                        <Label Text="Hello"/>
                </StackLayout>
        </ScrollView>
</VerticalStackLayout>

Before	After

[jfversluis]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[rmarinho]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).