Quarantine some 'ThreadingAppTest' and 'ThreadingHostedAppTest` tests (#54755)

* Quarantine 'ThreadingAppTest.HasHeading' and 'ThreadingAppTest.IsStarted'

- Microsoft.AspNetCore.Components.E2ETest.Tests.ThreadingAppTest.IsStarted
- Microsoft.AspNetCore.Components.E2ETest.Tests.ThreadingAppTest.HasHeading

Issue: #54754

* Quarantine ThreadingHostedAppTest.{HasHeading,CounterPageCanUseThreads,NavMenuHighlightsCurrentLocation}

Issue: #54761

* fix build

Author: radical

src/Components/test/E2ETest/Tests/ThreadingAppHostedTest.cs

@@ -4,6 +4,7 @@
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure;
 using Microsoft.AspNetCore.Components.E2ETest.Infrastructure.ServerFixtures;
 using Microsoft.AspNetCore.E2ETesting;
+using Microsoft.AspNetCore.InternalTesting;
 using OpenQA.Selenium;
 using Xunit.Abstractions;
 
@@ -32,12 +33,14 @@ protected override void InitializeAsyncCore()
     }
 
     [Fact]
+    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/54761")]
     public void HasHeading()
     {
         Assert.Equal("Hello, world!", Browser.Exists(By.TagName("h1")).Text);
     }
 
     [Fact]
+    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/54761")]
     public void NavMenuHighlightsCurrentLocation()
     {
         var activeNavLinksSelector = By.CssSelector(".sidebar a.active");
@@ -64,6 +67,7 @@ public void NavMenuHighlightsCurrentLocation()
     }
 
     [Fact]
+    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/54761")]
     public void CounterPageCanUseThreads()
     {
         // Navigate to "Counter"

src/Components/test/E2ETest/Tests/ThreadingAppTest.cs

@@ -34,6 +34,7 @@ public void HasTitle()
     }
 
     [Fact]
+    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/54754")]
     public void HasHeading()
     {
         Assert.Equal("Hello, world!", Browser.Exists(By.TagName("h1")).Text);
@@ -105,6 +106,7 @@ public void HasFetchDataPage()
     }
 
     [Fact]
+    [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/54754")]
     public void IsStarted()
     {
         // Read from property