Convert sort specs to use shared pagination

examples

spec/graphql/types/issuable_sort_enum_spec.rb

@@ -9,7 +9,7 @@ describe Types::IssuableSortEnum do
     expect(described_class.values.keys).to include(
       *%w[PRIORITY_ASC PRIORITY_DESC
           LABEL_PRIORITY_ASC LABEL_PRIORITY_DESC
-          MILESTONE_DUE_ASC MILESTONE_DUE_DESC
-         ])
+          MILESTONE_DUE_ASC MILESTONE_DUE_DESC]
+    )
   end
 end