Ensure to run all rails logic when deleting pages deployments

The usage of `delete_all` caused problems in the past where the
operation wasn't deleting the deployment files.

To ensure we're calling all rails callbacks while deleting pages
deployments, it's better to use `destroy!`.

Related to: #457159

app/workers/pages/deactivated_deployments_delete_cron_worker.rb

@@ -12,8 +12,7 @@ class DeactivatedDeploymentsDeleteCronWorker
 
     def perform
       PagesDeployment.deactivated.each_batch do |deployments|
-        deployments.each { |deployment| deployment.file.remove! }
-        deployments.delete_all
+        deployments.each(&:destroy!)
       end
     end
   end