dotnet test MTP: Don't use CallTarget (#50569)

Author: Youssef1313

src/Layout/redist/MSBuildImports/Current/Microsoft.Common.CrossTargeting.targets/ImportAfter/Microsoft.TestPlatform.CrossTargeting.targets

@@ -100,8 +100,8 @@ Copyright (c) .NET Foundation. All rights reserved.
   =================================================================================
   -->
 
-  <Target Name="_MTPBuild" DependsOnTargets="_ComputeTargetFrameworkItems">
-    <CallTarget Targets="Build" />
+  <Target Name="_MTPBuild">
+    <MSBuild Projects="$(MSBuildProjectFullPath)" />
   </Target>
 
 </Project>

src/Layout/redist/MSBuildImports/Current/Microsoft.Common.targets/ImportAfter/Microsoft.TestPlatform.ImportAfter.targets

@@ -18,6 +18,6 @@ Copyright (c) .NET Foundation. All rights reserved.
   </PropertyGroup>
   <Import Condition="Exists('$(VSTestTargets)')" Project="$(VSTestTargets)" />
   <Target Name="_MTPBuild">
-    <CallTarget Targets="Build" Condition="'$(IsTestingPlatformApplication)'=='true'" />
+    <MSBuild Projects="$(MSBuildProjectFullPath)" Condition="'$(IsTestingPlatformApplication)'=='true'" />
   </Target>
 </Project>