Remove work_packages_duration_field_active feature flag from Settings

config/constants/settings/definitions.rb

@@ -986,10 +986,6 @@ Settings::Definition.define do
   add :work_package_startdate_is_adddate,
       default: false
 
-  add :work_packages_duration_field_active,
-      default: Rails.env.development?,
-      format: :boolean
-
   add :youtube_channel,
       default: 'https://www.youtube.com/c/OpenProjectCommunity',
       writable: false

db/migrate/20220817154403_remove_work_packages_duration_field_active_setting.rb

@@ -0,0 +1,5 @@
+class RemoveWorkPackagesDurationFieldActiveSetting < ActiveRecord::Migration[7.0]
+  def change
+    Setting.where(name: 'work_packages_duration_field_active').destroy_all
+  end
+end

lib/open_project/feature_decisions.rb

@@ -40,8 +40,9 @@ module OpenProject
     #     Setting.feature_your_module_active || Date.today > release_date
     #   end
 
+    # TODO: remove this feature flag
     def self.work_packages_duration_field_active?
-      Setting.work_packages_duration_field_active
+      true
     end
   end
 end