Fix solution restore in libraries (#38294)

Fixes https://github.com/dotnet/runtime/issues/37358

Directory.Solution.props

@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <!-- For solution restore, msbuild doesn't honor the property set in Directory.Build.props. -->
+    <RestoreUseStaticGraphEvaluation>true</RestoreUseStaticGraphEvaluation>
+  </PropertyGroup>
+</Project>