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[iOS] Fix issue that does not allow scrolling in WebView with PDF
Description of Change
Fix issue that does not allow scrolling in WebView with PDF on iOS.
Initially, I started by checking the status of the WebView: if internal UIScrollView scrolling was enabled, if the assigned size was correct, etc. Everything is fine so let's go check the hierarchy. It was interesting that the problem does not appear without a Layout as a parent. Reviewing I realized that the problem comes from the changes applied in https://github.com/dotnet/maui/pull/17286 related to InputTransparent. Applied changes to keep the InputTransparent working and fix the issue.
Issues Fixed
Fixes #18716
What happens when the dev sets the webview as input transparent? can you scroll? what does the hit test result become? I cannot recall if the user interaction value is "viral" and the hit test blocks hitting all children.
