Move unified build sdk validation to a test project

src/SourceBuild/content/Directory.Build.props

@@ -34,7 +34,7 @@
     <RootRepo Condition="'$(ShortStack)' == 'true'">runtime</RootRepo>
   </PropertyGroup>
 
-  <!-- See https://github.com/dotnet/arcade/blob/main/Documentation/UnifiedBuild/Unified-Build-Controls.md#output-controls for 
+  <!-- See https://github.com/dotnet/arcade/blob/main/Documentation/UnifiedBuild/Unified-Build-Controls.md#output-controls for
        control set definition. -->
   <PropertyGroup Label="CalculateArch">
     <!-- Build architecture is what we are building on. -->
@@ -137,6 +137,8 @@
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
     <!-- By default, the VMR builds with online sources when not building source-only. -->
     <DotNetBuildWithOnlineFeeds Condition="'$(DotNetBuildWithOnlineFeeds)' == '' and '$(DotNetBuildSourceOnly)' != 'true'">true</DotNetBuildWithOnlineFeeds>
+
+    <DisableArcadeExcludeFromBuildSupport>true</DisableArcadeExcludeFromBuildSupport>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -205,7 +207,6 @@
   <PropertyGroup>
     <MicrosoftDotNetUnifiedBuildTasksAssembly>$([MSBuild]::NormalizePath('$(ArtifactsBinDir)', 'Microsoft.DotNet.UnifiedBuild.Tasks', '$(Configuration)', 'Microsoft.DotNet.UnifiedBuild.Tasks.dll'))</MicrosoftDotNetUnifiedBuildTasksAssembly>
     <MicrosoftDotNetSourceBuildTasksLeakDetectionAssembly>$([MSBuild]::NormalizePath('$(ArtifactsBinDir)', 'Microsoft.DotNet.SourceBuild.Tasks.LeakDetection', '$(Configuration)', 'Microsoft.DotNet.SourceBuild.Tasks.LeakDetection.dll'))</MicrosoftDotNetSourceBuildTasksLeakDetectionAssembly>
-    <SdkArchiveDiffTasksAssembly>$([MSBuild]::NormalizePath('$(ArtifactsBinDir)', 'Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff', '$(Configuration)', 'Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff.dll'))</SdkArchiveDiffTasksAssembly>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(EnablePoison)' == 'true'">

src/SourceBuild/content/Directory.Build.targets

@@ -19,6 +19,7 @@
     -->
     <PropertyGroup>
       <SdkFilename>%(SdkTarballItem.Filename)%(SdkTarballItem.Extension)</SdkFilename>
+      <SdkTarballPath>%(SdkTarballItem.Identity)</SdkTarballPath>
       <SourceBuiltSdkVersion>$(SdkFilename.Replace('$(SdkFilenamePrefix)','').Replace('-$(TargetRid)$(ArchiveExtension)',''))</SourceBuiltSdkVersion>
     </PropertyGroup>
   </Target>

src/SourceBuild/content/eng/Versions.props

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <VersionPrefix>0.1.0</VersionPrefix>
     <PreReleaseVersionLabel>alpha.1</PreReleaseVersionLabel>
+    <UseVSTestRunner>true</UseVSTestRunner>
   </PropertyGroup>
   <PropertyGroup>
     <!--

src/SourceBuild/content/eng/build.sourcebuild.targets

@@ -40,11 +40,10 @@
 
       <IntermediateSdkSymbolsLayout>$(BaseIntermediateOutputPath)SdkSymbols</IntermediateSdkSymbolsLayout>
       <IntermediateSdkLayout>$(BaseIntermediateOutputPath)Sdk</IntermediateSdkLayout>
-      <SdkTarball>%(SdkTarballItem.Identity)</SdkTarball>
     </PropertyGroup>
 
     <MakeDir Directories="$(IntermediateSdkLayout)" />
-    <Exec Command="tar -xzf $(SdkTarball) -C $(IntermediateSdkLayout)" />
+    <Exec Command="tar -xzf $(SdkTarballPath) -C $(IntermediateSdkLayout)" />
 
     <CreateSdkSymbolsLayout SdkLayoutPath="$(IntermediateSdkLayout)"
                             AllSymbolsPath="$(IntermediateSymbolsRootDir)"

src/SourceBuild/content/eng/tools/init-build.proj

@@ -15,7 +15,7 @@
       UnpackTarballs;
       BuildUnifiedBuildTasks;
       BuildMSBuildSdkResolver;
-      BuildSdkArchiveDiff;
+      RestoreUnifiedBuildValidationTests;
       BuildLeakDetection;
       ExtractToolPackage;
       GenerateRootFs;
@@ -113,13 +113,11 @@
     </Touch>
   </Target>
 
-  <Target Name="BuildSdkArchiveDiff"
+  <Target Name="RestoreUnifiedBuildValidationTests"
           Condition="'$(ShortStack)' != 'true' and '$(PortableBuild)' == 'true' and '$(PgoInstrument)' != 'true'" >
-    <MSBuild Projects="tasks\Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff\Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff.csproj"
+    <MSBuild Projects="../../test/Microsoft.DotNet.UnifiedBuild.Tests/Microsoft.DotNet.UnifiedBuild.Tests.csproj"
              Targets="Restore"
              Properties="MSBuildRestoreSessionId=$([System.Guid]::NewGuid())" />
-    <MSBuild Projects="tasks\Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff\Microsoft.DotNet.SourceBuild.Tasks.SdkArchiveDiff.csproj"
-             Targets="Build" />
   </Target>
 
   <Target Name="GenerateRootFs"