Add direct reference to xunit.runner.utility (#10271)

Add direct reference to xunit.runner.utility to the IntegrationTests csproj
Add the Directory.Packages.props value.  This uses the version integration tests are attempting to load.

Directory.Packages.props

@@ -121,6 +121,7 @@
     <PackageVersion Include="xunit" Version="$(_XunitPackageVersion)" />
     <PackageVersion Include="Xunit.Combinatorial" Version="1.5.25" />
     <PackageVersion Include="xunit.extensibility.execution" Version="$(_XunitPackageVersion)" />
+    <PackageVersion Include="xunit.runner.utility" Version="2.4.1" />
     <PackageVersion Include="Xunit.StaFact" Version="1.2.46-alpha" />
   </ItemGroup>
 </Project>

src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/Microsoft.VisualStudio.Razor.IntegrationTests.csproj

@@ -35,6 +35,7 @@
     <PackageReference Include="NuGet.SolutionRestoreManager.Interop" />
     <PackageReference Include="Microsoft.Internal.VisualStudio.Shell.Framework" />
     <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.utility" />
   </ItemGroup>
 
   <ItemGroup>