Added schema enity type

Author: Microsoft Graph DevX Tooling

transforms/csdl/preprocess_csdl_test_input.xml

@@ -56,6 +56,10 @@
             <EntityType Name="synchronizationJob" BaseType="graph.entity">
                 <NavigationProperty Name="schema" Type="graph.synchronizationSchema" ContainsTarget="true"/>
             </EntityType>
+            <EntityType Name="schema" BaseType="graph.entity">
+                <Property Name="baseType" Type="Edm.String" Nullable="false"/>
+                <Property Name="properties" Type="Collection(graph.property)"/>
+            </EntityType>
             <EntityType Name="synchronizationSchema" BaseType="graph.entity">
                 <Property Name="synchronizationRules" Type="Collection(graph.synchronizationRule)"/>
                 <Property Name="version" Type="Edm.String"/>