Update publish profile tests to add SC explicitly per .net 8 breaking change

Author: nagilson

src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAHelloWorldProject.cs

@@ -980,7 +980,7 @@ public void It_publishes_with_a_publish_profile(bool? selfContained, bool? useAp
   <PropertyGroup>
     <RuntimeIdentifier>{rid}</RuntimeIdentifier>
     {(selfContained.HasValue ? $"<SelfContained>{selfContained}</SelfContained>" : "")}
-    {((!(selfContained ?? true) && useAppHost.HasValue) ? $"<UseAppHost>{useAppHost}</UseAppHost>" : "")}
+    {((!(selfContained ?? false) && useAppHost.HasValue) ? $"<UseAppHost>{useAppHost}</UseAppHost>" : "")}
   </PropertyGroup>
 </Project>
 ");

src/Tests/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAWebApp.cs

@@ -194,7 +194,7 @@ public void PublishWebAppWithPublishProfile(bool? selfContained, bool? useAppHos
   <PropertyGroup>
     <RuntimeIdentifier>{rid}</RuntimeIdentifier>
     {(selfContained.HasValue ? $"<SelfContained>{selfContained}</SelfContained>" : "")}
-    {((!(selfContained ?? true) && useAppHost.HasValue) ? $"<UseAppHost>{useAppHost}</UseAppHost>" : "")}
+    {((!(selfContained ?? false) && useAppHost.HasValue) ? $"<UseAppHost>{useAppHost}</UseAppHost>" : "")}
   </PropertyGroup>
 </Project>
 ");