test: Add validation for unfocus on empty space

[MartinZikmund]

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Please check if your PR fulfills the following requirements:

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• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
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[Copilot]

Pull Request Overview

This PR adds a test to validate that a button loses focus when tapping on an empty space outside of it.

• Introduced a new test method "When_Tapped_Empty_Space" in FocusManager tests
• Configured the test to be ignored on platforms without input injector support

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[Copilot]

Pull Request Overview

This PR adds a new UI test that validates focus behavior when tapping on an empty space outside a button. The key changes include:

• Removal of an extra empty line in the using directives.
• Addition of the test method "When_Tapped_Empty_Space" to verify that a button loses focus when the user taps outside it.
• Implementation of conditional test execution based on platform capabilities.

Comments suppressed due to low confidence (2)

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Input/Given_FocusManager.cs:300

• [nitpick] Consider computing the tap coordinates relative to the button's position to reduce the risk of test fragility in different screen layouts or device scales.

TestServices.InputHelper.Tap(new(10, 10));

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Input/Given_FocusManager.cs:279

• [nitpick] Consider renaming the test method to 'When_TappedOnEmptySpace' for improved readability.

public async Task When_Tapped_Empty_Space()

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[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-19827/index.html

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-19827/index.html

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-19827/index.html