Delay Razor SDK test asset project restoration

- depend on Microsoft.AspNetCore.App projects
- do not restore test asset projects until just before tests run

nit: do not pass `$(MicrosoftNetCompilersToolsetPackageVersion)` into test asset projects
- not needed because generated files already contain the right information
- even without that, the Directory.Build.* files import eng/Versions.props

Author: dougbu

Diff for: src/Razor/Microsoft.NET.Sdk.Razor/integrationtests/Microsoft.NET.Sdk.Razor.IntegrationTests.csproj

@@ -33,6 +33,18 @@
     <Reference Include="Microsoft.NET.Sdk.Razor" ReferenceOutputAssembly="false" SkipGetTargetFrameworkProperties="true" />
   </ItemGroup>
 
+  <!-- Ensure shared framework and targeting packs are laid out under .dotnet/ before executing non-Helix tests. -->
+  <ItemGroup Condition=" '$(ASPNETCORE_TEST_LOG_DIR)' == '' AND '$(IsHelixJob)' != 'true' ">
+    <ProjectReference Include="$(RepoRoot)src\Framework\App.Ref\src\Microsoft.AspNetCore.App.Ref.csproj"
+        Condition=" $(IsTargetingPackBuilding) "
+        ReferenceOutputAssembly="false"
+        SkipGetTargetFrameworkProperties="true" />
+    <ProjectReference Include="$(RepoRoot)src\Framework\App.Runtime\src\Microsoft.AspNetCore.App.Runtime.csproj"
+        Condition=" !$(IsTargetingPackBuilding) "
+        ReferenceOutputAssembly="false"
+        SkipGetTargetFrameworkProperties="true" />
+  </ItemGroup>
+
   <Target Name="GenerateTestData" BeforeTargets="GetAssemblyAttributes">
     <Exec Condition="'$(OS)' == 'Windows_NT'" Command="&quot;$(NuGetPackageRoot)vswhere\$(VSWhereVersion)\tools\vswhere.exe&quot; -latest -prerelease -property installationPath -requires Microsoft.Component.MSBuild" ConsoleToMsBuild="true" StandardErrorImportance="high">
       <Output TaskParameter="ConsoleOutput" PropertyName="_VSInstallDir" />
@@ -54,10 +66,10 @@
     </ItemGroup>
   </Target>
 
-  <Target Name="RestoreTestProjects" BeforeTargets="Restore;Build" Condition="'$(DotNetBuildFromSource)' != 'true'">
-    <MSBuild Projects="..\..\test\testassets\RestoreTestProjects\RestoreTestProjects.csproj" Targets="Restore" Properties="MicrosoftNetCompilersToolsetPackageVersion=$(MicrosoftNetCompilersToolsetPackageVersion);RepoRoot=$(RepoRoot)" />
-    <MSBuild Projects="..\..\test\testassets\PackageLibraryDirectDependency\PackageLibraryDirectDependency.csproj" Targets="Restore" Properties="MicrosoftNetCompilersToolsetPackageVersion=$(MicrosoftNetCompilersToolsetPackageVersion);RepoRoot=$(RepoRoot)" />
-    <MSBuild Projects="..\..\test\testassets\PackageLibraryTransitiveDependency\PackageLibraryTransitiveDependency.csproj" Targets="Restore" Properties="MicrosoftNetCompilersToolsetPackageVersion=$(MicrosoftNetCompilersToolsetPackageVersion);RepoRoot=$(RepoRoot)" />
+  <Target Name="RestoreTestProjects" BeforeTargets="RunTests;Test;VSTest" Condition="'$(DotNetBuildFromSource)' != 'true'">
+    <MSBuild Projects="..\..\test\testassets\RestoreTestProjects\RestoreTestProjects.csproj" Targets="Restore" Properties="RepoRoot=$(RepoRoot)" />
+    <MSBuild Projects="..\..\test\testassets\PackageLibraryDirectDependency\PackageLibraryDirectDependency.csproj" Targets="Restore" Properties="RepoRoot=$(RepoRoot)" />
+    <MSBuild Projects="..\..\test\testassets\PackageLibraryTransitiveDependency\PackageLibraryTransitiveDependency.csproj" Targets="Restore" Properties="RepoRoot=$(RepoRoot)" />
   </Target>
 
   <Target Name="EnsureLogFolder" AfterTargets="Build">