show which instructeur took decision and when

and also replace "sans suite" by "classé sans suite"

spec/controllers/api/v2/graphql_controller_spec.rb

@@ -596,7 +596,7 @@ describe API::V2::GraphqlController do
           it "should fail" do
             expect(gql_errors).to eq(nil)
             expect(gql_data).to eq(dossierRefuser: {
-              errors: [{ message: "Le dossier est déjà sans suite" }],
+              errors: [{ message: "Le dossier est déjà classé sans suite" }],
               dossier: nil
             })
           end