Fixed PreferredStatusBarStyle not called on page renderers

[knasher]

Description of Change

• Added override for ChildViewControllerForStatusBarStyle to ShellFlyoutRenderer to return renderer for current page
• Added override for ModalPresentationCapturesStatusBarAppearance to ModalWrapper so modal pages can also change style
• Added code for manual test

Issues Resolved

When using the Shell the PreferredStatusBarStyle method is not called in an iOS PageRenderer and therefore the colour of the status bar text cannot be changed on devices using latest OS.

• fixes [Bug] PreferredStatusBarStyle is not called inside PageRenderers when using the Shell #14246

API Changes

Added:

• public override UIViewController ChildViewControllerForStatusBarStyle() -> ShellFlyoutRenderer.cs
• public override bool ModalPresentationCapturesStatusBarAppearance => true; -> ModalWrapper.cs
• Push Modal button -> StorePages.cs

Platforms Affected

• iOS

Behavioral/Visual Changes

PreferredStatusBarStyle will begin to work when using page renderers and the Shell

Testing Procedure

• Load Xamarin.Forms.Controls app in iOS
• Tap SwapRoot - Store shell located on the top list
• Notice the status bar text is black
• Tap List tab
• The status bar text is now white
• Tap Home tab
• The status bar text is now black again
• Scroll to bottom of the list
• Tap Push Model
• The status bar text is now white again (I should have changed the background colour of the page so it can be seen)

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)

[net-foundation-cla]

All CLA requirements met.

[knasher]

@PureWeen Could you take a look at my PR please? It's been open for a little while and I'd love to get this fix into Forms so I can get the status bar style changing on the app I want to release

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jfversluis]

Hey @knasher thanks for your patience here! Just tried this and seems to work great. Awesome first contribution, thank you so much. We hope that you're willing and able to continue this for .NET MAUI and we'll promise to get to it a bit sooner 😬

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