[10.0.101] Fix the SR10 test failures

[Shalini-Ashokan]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Root cause

This PR addresses Android, iOS, and Mac Catalyst test failures.

Android

The MediaPicker tests searched for a specific Android Photo Picker "Cancel" button using XPath. The system picker UI differs across Android versions, causing the tests to time out.

Mac Catalyst

Issue36769 test fails because the OnAppearing code in CI runs before the button is loaded in the UI.

Description of Change

• Removed WaitForPhotoPicker() from the Android MediaPicker tests.
• Used App.Back() directly to close the picker before verifying cancellation.
• Re-saved the expected iOS snapshots.
• Fixed test case failure in Issue36769 - Switched Issue36749 button background verification from OnAppearing to the Button's Loaded event for reliable pass/fail checks

Tests

Android

• OverlappingPhotoPickerRequestsAreRejected
• PickPhotosAsyncShouldReturnFromChildActivity

iOS

• ShellTabBarBackgroundColor
• MoreTabShouldRespectNavBarCustomization
• BottomTabColorTest

Mac Catalyst

• NativeStyledButtonPreservesInitialAndClearsDetachedBackground

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[dotnet-policy-service]

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

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