api_entreprise: add a feature flag for toggling API INSEE v3

app/lib/api_entreprise/api.rb

@@ -42,7 +42,11 @@ class ApiEntreprise::API
   def self.url(resource_name, siret_or_siren)
     base_url = [API_ENTREPRISE_URL, resource_name, siret_or_siren].join("/")
 
-    "#{base_url}?with_insee_v3=true"
+    if Flipflop.insee_api_v3?
+      base_url += "?with_insee_v3=true"
+    end
+
+    base_url
   end
 
   def self.params(siret_or_siren, procedure_id)

config/features.rb

@@ -20,6 +20,8 @@ Flipflop.configure do
   group :production do
     feature :remote_storage,
       default: ENV['FOG_ENABLED'] == 'enabled'
+    feature :insee_api_v3,
+      default: true
     feature :weekly_overview,
       default: ENV['APP_NAME'] == 'tps'
     feature :pre_maintenance_mode