Enable pages_serve_from_migrated_zip by default

app/models/pages/lookup_path.rb

@@ -52,7 +52,7 @@ module Pages
 
       return if deployment.file.file_storage? && !Feature.enabled?(:pages_serve_with_zip_file_protocol, project, default_enabled: true)
 
-      return if deployment.migrated? && !Feature.enabled?(:pages_serve_from_migrated_zip, project)
+      return if deployment.migrated? && !Feature.enabled?(:pages_serve_from_migrated_zip, project, default_enabled: true)
 
       global_id = ::Gitlab::GlobalId.build(deployment, id: deployment.id).to_s
 

changelogs/unreleased/300021-rollout-serving-migrated-data-feature-flag-pages_serve_from_migrat.yml

+---
+title: Enable serving GitLab Pages sites migrated to zip storage
+merge_request: 55847
+author:
+type: added

config/feature_flags/development/pages_serve_from_migrated_zip.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/300021
 milestone: '13.9'
 type: development
 group: group::release
-default_enabled: false
+default_enabled: true