Move Composite files to easily-found folder (#42296)

- see discussion starting at <#41855 (comment)>
- short answer: wildcards do not work in artifact paths

Author: dougbu

.azure/pipelines/ci.yml

@@ -294,7 +294,7 @@ stages:
       - name: Windows_ANCMIISExpress_Msi
         path: artifacts/bin/AncmIISExpressV2
       - name: Windows_CompositeImages
-        path: artifacts/bin/Microsoft.AspNetCore.App.Runtime/**/Composite
+        path: artifacts/obj/Composite/Release
 
   # Build Windows ARM
   - template: jobs/default-build.yml

src/Framework/App.Runtime/src/Microsoft.AspNetCore.App.Runtime.csproj

@@ -466,7 +466,7 @@ This package is an internal implementation of the .NET Core SDK and is not meant
     DependsOnTargets="_ExpandRuntimePackageRoot">
 
     <PropertyGroup>
-      <CompositeTargetDir>$(TargetDir)Composite\</CompositeTargetDir>
+      <CompositeTargetDir>$([MSBuild]::NormalizeDirectory('$(ArtifactsObjDir)', 'Composite', '$(Configuration)'))</CompositeTargetDir>
       <ManagedAssetsFullPath>$(RuntimePackageRoot)$(ManagedAssetsPackagePath)</ManagedAssetsFullPath>
       <NativeAssetsFullPath>$(RuntimePackageRoot)$(NativeAssetsPackagePath)</NativeAssetsFullPath>