ci: Add mobile UI Tests

[erikvilima]

closes #2680

PR Type

What kind of change does this PR introduce?

• Build or CI related changes

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Internal Issue (If applicable):

[kazo0]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[kazo0]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[erikvilima]

/azp run

[azure-pipelines]

Azure Pipelines failed to run 1 pipeline(s).

[erikvilima]

Tests failing locally on Android

Given_ContentDialog

When_SimpleContentDialog: The following tests fail because the Dialog closes right after it is open, not allowing enough time for the next actions to be performed.

[TestCase("SimpleDialogCodebehindWithCancelButton", 0, false)]
[TestCase("SimpleDialogCodebehindWithCancelButton", 3, true)]

Given_FlyoutDialog

When_FlyoutsButton: The tests fail because the Flyout closes right after it is open, not allowing enough time for the next actions to be performed.
[TestCase("FlyoutDialogCodebehindWithCancelButton", 0, false)]
[TestCase("FlyoutDialogCodebehindWithCancelButton", 3, true)]

Given_MessageDialog

When_MessageDialogFromXAML: The test fail because the MessageDialog is not closed. Apparently this code (I can confirm the code is being executed) doesn't work on Android.

Given_Responsive

When_Navigation_Responsive: When navigating to another page we check that the ListView in the previous page is not visible, but it actually is visible, even if not showing.

[erikvilima]

Even though we're setting [ActivePlatforms(Platform.Browser)] here:

uno.extensions/testing/TestHarness/TestHarness.UITest/Ext/Navigation/PageNavigation/Given_PageNavigation.cs

Lines 191 to 193 in 82e9dd8

	[Test]
	[ActivePlatforms(Platform.Browser)]
	public void When_PageNavigationNavigateRootUpdateUrl()

this test is running on Android.

cc @kazo0