Merge pull request #9726 from dotnet/dev-nkolev92-addPruning

Add _RestorePackagePruningDefault to nomination

Author: drewnoakes

src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/Rules/NuGetRestore.xaml

@@ -109,6 +109,10 @@
                   ReadOnly="True"
                   Visible="False" />
 
+  <StringProperty Name="_RestorePackagePruningDefault"
+                  ReadOnly="True"
+                  Visible="False" />
+
   <StringProperty Name="RestoreFallbackFolders"
                   ReadOnly="True"
                   Visible="False" />