Do a few tricks to shorten the intermediate output paths for the runtime packs (#59479)

* Do a few tricks to shorten the intermediate output paths for the runtime packs

The Wix tooling can't handle long paths, which is blocking VMR integration. This change gets our paths to be short enough that even a long-named analyzer's resource DLL won't go past MAX_PATH in a VMR build.

* Set OutDirName for the ref pack as well.

* Adjust path to RuntimeList

Author: jkoritzinsky

src/Framework/App.Ref/src/Directory.Build.props

@@ -0,0 +1,7 @@
+<Project>
+  <PropertyGroup>
+    <OutDirName Condition="'$(MSBuildProjectName)' == 'Microsoft.AspNetCore.App.Ref'">aspnetcore-ref</OutDirName>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+  </PropertyGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory)..\, Directory.Build.props))\Directory.Build.props" />
+</Project>

src/Framework/App.Runtime/src/Directory.Build.props

@@ -0,0 +1,7 @@
+<Project>
+  <PropertyGroup>
+    <OutDirName Condition="'$(MSBuildProjectName)' == 'Microsoft.AspNetCore.App.Runtime'">aspnetcore-sfx</OutDirName>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+  </PropertyGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory)..\, Directory.Build.props))\Directory.Build.props" />
+</Project>

src/Framework/test/Microsoft.AspNetCore.App.UnitTests.csproj

@@ -16,7 +16,7 @@
       This depends on internal implementation details of the SharedFramework SDK and should be changed to use a supported mechanism
       to discover the runtime list.
     -->
-    <None Include="$(ArtifactsObjDir)Microsoft.AspNetCore.App.Runtime\$(Configuration)\$(DefaultNetCoreTargetFramework)\$(TargetRuntimeIdentifier)\RuntimeList.xml"
+    <None Include="$(ArtifactsObjDir)aspnetcore-sfx\$(Configuration)\$(TargetRuntimeIdentifier)\RuntimeList.xml"
         CopyToOutputDirectory="PreserveNewest" />
 
     <!-- Ignore aspnetcorev2_inprocess because tests expect only managed assemblies in this item group. -->