[NET10] Enable Nullability on ShellPageRendererTracker

[jsuarezruiz]

Description of Change

Enable Nullability on ShellPageRendererTracker.

Issues Fixed

Fixes #27162

[Copilot]

Pull Request Overview

This PR enables nullability on ShellPageRendererTracker and updates related iOS renderer classes to improve null-safety. Key changes involve enabling #nullable in ShellPageRendererTracker, updating property types and event handler signatures to account for nullability, and minor refactoring in UIContainerView.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/UIContainerView.cs	Minor refactoring in Disconnect with added null-safety handling.
src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellPageRendererTracker.cs	Enabled #nullable, updated properties and event handler signatures, and adjusted toolbar/search handling for nullability.

Comments suppressed due to low confidence (1)

src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellPageRendererTracker.cs:835

• Method name 'DettachSearchController' contains a typo; please consider renaming it to 'DetachSearchController'.

void DettachSearchController()

[rmarinho]

why are adding this here instead of fixing the all file?

[jsuarezruiz]

Because this properties are implementing the IShellPageRendererTracker interface. To add nullability here, we need to update the interface too.

[rmarinho]

/rebase

[jsuarezruiz]

All the iOS tests passed:

[rmarinho]

Can we make sure we add brackets to all ifs ?

[jsuarezruiz]

Can we make sure we add brackets to all ifs ?

Have done the changes, could you review it again?

[rmarinho]

/rebase