Fix Disabling some image tests after updating net9.0 with main

[devanathan-vaithiyanathan]

Description of Change

After merging the net9 branch into main, two UI tests were failing:
1. Android Test: ImageDoesntDisappearWhenNavigatingBack

• After merging the net9 branch into main, this test began passing successfully without additional modifications.

2. Windows Test: Issue31366PushingWithModalStackCausesIncorrectStackOrder

• To resolve this test, I made adjustments in the HostApp sample, which contains two buttons. Initially, after clicking the first button, the sample displayed an empty white screen, blocking access to the second button. This issue caused the test to fail with a WaitForElement exception, as the second button was not visible.
• I added a delay, ensuring the second button becomes visible and clickable, which resolved the issue and allowed the test to pass as expected.

Issues Fixed

Fixes #24243

Output Screenshot

Android:

Windows

[dotnet-policy-service]

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]

/azp run

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