Added constant and changelog entry

ee/changelogs/unreleased/197923-add-pipeline-to-packages-list-api.yml

+---
+title: Adds additional pipeline information to packages API result
+merge_request: 28040
+author:
+type: added

ee/lib/ee/api/entities/package.rb

@@ -27,8 +27,10 @@ module EE
         expose :project_path, if: ->(obj, opts) { opts[:group] && Ability.allowed?(opts[:user], :read_project, obj.project) }
         expose :tags
 
+        PIPELINE_PROPS = [:created_at, :id, :sha, :ref, :status, :updated_at, :web_url, user: [:name, :avatar_url]].freeze
+
         expose :pipeline, if: ->(obj) { obj.build_info } do |package|
-          ::API::Entities::Pipeline.represent package.build_info.pipeline, only: [:created_at, :id, :sha, :ref, :status, :updated_at, :web_url, user: [:name, :avatar_url]]
+          ::API::Entities::Pipeline.represent package.build_info.pipeline, only: PIPELINE_PROPS
         end
 
         private