Remove pages_serve_from_migrated_zip feature flag

app/models/pages/lookup_path.rb

@@ -52,8 +52,6 @@ module Pages
 
       return if deployment.file.file_storage? && !Feature.enabled?(:pages_serve_with_zip_file_protocol, project, default_enabled: :yaml)
 
-      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: Remove pages_serve_from_migrated_zip feature flag
+merge_request: 59002
+author:
+type: added

config/feature_flags/development/pages_serve_from_migrated_zip.yml

----
-name: pages_serve_from_migrated_zip
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52573
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/300021
-milestone: '13.9'
-type: development
-group: group::release
-default_enabled: true

spec/models/pages/lookup_path_spec.rb

@@ -136,14 +136,6 @@ RSpec.describe Pages::LookupPath do
             )
           end
         end
-
-        context 'when pages_serve_from_migrated_zip feature flag is disabled' do
-          before do
-            stub_feature_flags(pages_serve_from_migrated_zip: false)
-          end
-
-          include_examples 'uses disk storage'
-        end
       end
     end
   end