Remove zip_pages_deployment feature flag

app/services/projects/update_pages_service.rb

@@ -125,8 +125,6 @@ module Projects
     end
 
     def create_pages_deployment(artifacts_path, build)
-      return unless Feature.enabled?(:zip_pages_deployments, project, default_enabled: true)
-
       # we're using the full archive and pages daemon needs to read it
       # so we want the total count from entries, not only "public/" directory
       # because it better approximates work we need to do before we can serve the site

config/feature_flags/development/zip_pages_deployments.yml

----
-name: zip_pages_deployments
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/42834
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/245308
-milestone: '13.5'
-type: development
-group: group::release management
-default_enabled: true

spec/services/projects/update_pages_service_spec.rb

@@ -105,16 +105,6 @@ RSpec.describe Projects::UpdatePagesService do
         end
       end
 
-      it 'does not create deployment when zip_pages_deployments feature flag is disabled' do
-        stub_feature_flags(zip_pages_deployments: false)
-
-        expect do
-          expect(execute).to eq(:success)
-        end.not_to change { project.pages_deployments.count }
-
-        expect(project.pages_metadatum.reload.pages_deployment_id).to be_nil
-      end
-
       it 'limits pages size' do
         stub_application_setting(max_pages_size: 1)
         expect(execute).not_to eq(:success)