Merge branch 'osw-enable-forks-removal-ff-by-default' into 'master'

Enable forks removal upon visibility decrease by default

See merge request gitlab-org/gitlab!21834

app/models/project.rb

@@ -740,7 +740,7 @@ class Project < ApplicationRecord
   end
 
   def unlink_forks_upon_visibility_decrease_enabled?
-    Feature.enabled?(:unlink_fork_network_upon_visibility_decrease, self)
+    Feature.enabled?(:unlink_fork_network_upon_visibility_decrease, self, default_enabled: true)
   end
 
   def empty_repo?