Include content files in Roslyn.VisualStudio.Setup.Interactive.vsix

Specifically, the default response files for initializing the Interactive
windows.

Fixes #4203

src/VisualStudio/SetupInteractive/VisualStudioSetupInteractive.csproj

@@ -44,14 +44,14 @@
     <ProjectReference Include="..\CSharp\Repl\CSharpVisualStudioRepl.csproj">
       <Project>{737ff62c-f068-4317-84d0-bfb210c17a4e}</Project>
       <Name>CSharpVisualStudioRepl</Name>
-      <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup;PkgDefProjectOutputGroup</IncludeOutputGroupsInVSIX>
+      <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup;PkgDefProjectOutputGroup;ContentFilesProjectOutputGroup</IncludeOutputGroupsInVSIX>
       <IncludeOutputGroupsInVSIXLocalOnly>DebugSymbolsProjectOutputGroup</IncludeOutputGroupsInVSIXLocalOnly>
       <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </ProjectReference>
     <ProjectReference Include="..\VisualBasic\Repl\BasicVisualStudioRepl.vbproj">
       <Project>{b4a38526-5f15-4ca8-b5e9-0ba04e547023}</Project>
       <Name>BasicVisualStudioRepl</Name>
-      <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup;PkgDefProjectOutputGroup</IncludeOutputGroupsInVSIX>
+      <IncludeOutputGroupsInVSIX>BuiltProjectOutputGroup;PkgDefProjectOutputGroup;ContentFilesProjectOutputGroup</IncludeOutputGroupsInVSIX>
       <IncludeOutputGroupsInVSIXLocalOnly>DebugSymbolsProjectOutputGroup</IncludeOutputGroupsInVSIXLocalOnly>
       <ForceIncludeInVSIX>true</ForceIncludeInVSIX>
     </ProjectReference>