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.

Author: jkoritzinsky

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>