chore(schema): add exports#job_status

Same behavior as Archive

On destroy tous les exports existants qui n'ont pas cette notion de status.

db/migrate/20220726151017_add_job_status_to_exports.rb

@@ -0,0 +1,7 @@
+class AddJobStatusToExports < ActiveRecord::Migration[6.1]
+  def change
+    safety_assured do
+      add_column :exports, :job_status, :string, null: false, default: "pending"
+    end
+  end
+end