Improve the Procedure factory

We can now specify how many types_de_champ a
procedure has

spec/factories/procedure.rb

@@ -30,12 +30,18 @@ FactoryGirl.define do
     end
 
     trait :with_type_de_champ do
-      after(:build) do |procedure, _evaluator|
+      transient do
+        types_de_champ_count 1
+      end
+
+      after(:build) do |procedure, evaluator|
+        evaluator.types_de_champ_count.times do
           type_de_champ = create(:type_de_champ_public)
 
           procedure.types_de_champ << type_de_champ
         end
       end
+    end
 
     trait :with_type_de_champ_private do
       after(:build) do |procedure, _evaluator|