[Windows] Fix FlyoutPage ShouldShowToolbarButton when overridden to return false, still shows button in title bar

[devanathan-vaithiyanathan]

Issue details

When Popover behavior is applied to a FlyoutPage with ShouldShowToolbarButton set to false, the hamburger icon still appears in the Windows title bar.

Root Cause

In Windows, When the ShouldToolBarButton is override as false, hardly setting WinUI IsPaneToggleButtonVisible as True based on FlyoutBehavior to control navigation visibility with no handling to restrict the visibility of the ToolBarButton.

Description of Change

Since we are controlling the DrawerToggleVisible value based on the visibility of the ToolBarButton, which in turn manages the visibility of the TogglePaneButton in WinUI. This ensures that the toolbar now correctly reflects the DrawerToggleVisible state, improving the consistency of navigation element.

Issues Fixed

Fixes #24547

Tested the behaviour in the following platforms

• [x] Android
• [x] Windows
• [x] iOS
• [x] Mac

Output Screenshot

Before	After

[dotnet-policy-service[bot]]

Hey there @devanathan-vaithiyanathan! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jsuarezruiz]

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[jsuarezruiz]

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