Fix syncing modal stack when the window is created/recreated

[PureWeen]

Description of Change

Fix ModalNavigationManager so it will reprocess the current Modal stack when the root window handler changes. Currently we aren't processing any modal pages pushed before the app has loaded and we don't reprocess the modal stack if the window is destroyed and recreated (Android).

This PR adds code to detect when we need to reprocess the modal stack based on the root view changing or being destroyed

Breaking Changes

• On Window if a lifecycle event is called at a place in time that doesn't make sense, we will now throw an exception. https://github.com/dotnet/maui/pull/13025/files#diff-07d5a2c0b5069d448623e88d890e41bc2c21e12f99bd01f1349903a332d4130cR475-R519

Issues Fixed

Fixes #8157

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🚨 Breaking change detected @davidbritch FYI

[PureWeen]

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