Merge branch '25344-fire-webhook-on-new-deployment-3' into 'master'

Enable deployment_webhooks feature flag

Closes #25344

See merge request gitlab-org/gitlab!39449

app/models/deployment.rb

@@ -148,7 +148,7 @@ class Deployment < ApplicationRecord
 
   def execute_hooks
     deployment_data = Gitlab::DataBuilder::Deployment.build(self)
-    project.execute_hooks(deployment_data, :deployment_hooks) if Feature.enabled?(:deployment_webhooks, project)
+    project.execute_hooks(deployment_data, :deployment_hooks) if Feature.enabled?(:deployment_webhooks, project, default_enabled: true)
     project.execute_services(deployment_data, :deployment_hooks)
   end