[release/6.0-preview1] Produce a .version file for Microsoft.NETCore.App in...

[release/6.0-preview1] Produce a .version file for Microsoft.NETCore.App in the runtime layout. (#47736)

* Produce a .version file for Microsoft.NETCore.App in the runtime layout.

* Update src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj

* Update src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj
Co-authored-by: NJeremy Koritzinsky <jekoritz@microsoft.com>
Co-authored-by: NJeremy Koritzinsky <jkoritzinsky@gmail.com>

src/installer/pkg/sfx/Microsoft.NETCore.App/Microsoft.NETCore.App.Runtime.sfxproj

@@ -121,6 +121,25 @@
     <NativeRuntimeAsset Include="$(_diaSymReaderPathIfExists)" />
   </ItemGroup>
 
+  <!-- VS uses this file to show the target framework in the drop down. -->
+  <Target Name="CreateDotVersionFile"
+          DependsOnTargets="InitializeSourceControlInformationFromSourceControlManager"
+          BeforeTargets="GetFilesToPublish"
+          Condition="'$(DisableSourceLink)' != 'true'">
+    <ItemGroup>
+      <_VersionFile Include="$(IntermediateOutputPath).version" TargetPath="shared/$(SharedFrameworkName)/$(Version)/" />
+    </ItemGroup>
+    <WriteLinesToFile
+      Lines="$(SourceRevisionId);$(Version)"
+      File="@(_VersionFile)"
+      Overwrite="true"
+      WriteOnlyWhenDifferent="true" />
+    <ItemGroup>
+      <FilesToPublish Include="@(_VersionFile)" />
+      <FileWrites Include="@(_VersionFile)" />
+    </ItemGroup>
+  </Target>
+
   <Import Project="Sdk.targets" Sdk="Microsoft.NET.Sdk" />
   <Import Project="Sdk.targets" Sdk="Microsoft.DotNet.SharedFramework.Sdk" />