[release/10.0.1xx-rc2] [net10.0] Temporarily disable flaky WebView tests using FlakyTest attribute (#31886)

* Initial plan

* Temporarily disable flaky WebView tests with FlakyTest attribute

Co-authored-by: rmarinho <1235097+rmarinho@users.noreply.github.com>

* Add tracking issue link to FlakyTest attributes

Co-authored-by: rmarinho <1235097+rmarinho@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rmarinho <1235097+rmarinho@users.noreply.github.com>

Author: 3 people

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue12134.cs

@@ -15,7 +15,7 @@ public Issue12134(TestDevice testDevice) : base(testDevice)
 		[Test]
 		[Category(UITestCategories.WebView)]
 		[Category(UITestCategories.Compatibility)]
-
+		[FlakyTest("Temporarily disabled due to flakiness in CI. Tracking issue: https://github.com/dotnet/maui/issues/31869")]
 		public void CookiesCorrectlyLoadWithMultipleWebViews()
 		{
 			VerifyInternetConnectivity();

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30575.cs

@@ -12,6 +12,7 @@ public Issue30575(TestDevice device) : base(device) { }
 
 	[Test]
 	[Category(UITestCategories.WebView)]
+	[FlakyTest("Temporarily disabled due to flakiness in CI. Tracking issue: https://github.com/dotnet/maui/issues/31869")]
 	public void WebViewShouldNotMirrored()
 	{
 		App.WaitForElement("WebViewLabel");