Fix baseline templates tests (#26825)

* Add missing error.cshtml.cs to baseline

* Unquarantine test

* Update MvcTemplateTest.cs

* Undo one unquarantine

Author: HaoK

src/ProjectTemplates/test/BaselineTest.cs

@@ -81,7 +81,6 @@ public ITestOutputHelper Output
 
         [Theory]
         [MemberData(nameof(TemplateBaselines))]
-        [QuarantinedTest("https://github.com/dotnet/aspnetcore/issues/23993")]
         public async Task Template_Produces_The_Right_Set_Of_FilesAsync(string arguments, string[] expectedFiles)
         {
             Project = await ProjectFactory.GetOrCreateProject("baseline" + SanitizeArgs(arguments), Output);

src/ProjectTemplates/test/template-baselines.json

@@ -915,6 +915,7 @@
         "Data/Migrations/ApplicationDbContextModelSnapshot.cs",
         "Pages/Counter.razor",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
         "Pages/_Host.cshtml",
@@ -954,6 +955,7 @@
         "Data/WeatherForecastService.cs",
         "Pages/Counter.razor",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
         "Pages/_Host.cshtml",
@@ -993,6 +995,7 @@
         "Data/WeatherForecastService.cs",
         "Pages/Counter.razor",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
         "Pages/_Host.cshtml",
@@ -1031,6 +1034,7 @@
         "Data/WeatherForecast.cs",
         "Data/WeatherForecastService.cs",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/Counter.razor",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
@@ -1070,6 +1074,7 @@
         "Data/WeatherForecastService.cs",
         "Pages/Counter.razor",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
         "Pages/_Host.cshtml",
@@ -1109,6 +1114,7 @@
         "Data/WeatherForecastService.cs",
         "Pages/Counter.razor",
         "Pages/Error.cshtml",
+        "Pages/Error.cshtml.cs",
         "Pages/FetchData.razor",
         "Pages/Index.razor",
         "Pages/_Host.cshtml",