Send last_edited_by_editor_id to Publishing API

This is a new field that will allow us to identify the last person who
has edited an Edition within the Publishing API.

app/presenters/formats/edition_format_presenter.rb

@@ -28,6 +28,7 @@ def required_fields(republish)
         schema_name:,
         document_type:,
         public_updated_at: public_updated_at.rfc3339(3),
+        last_edited_by_editor_id:,
         publishing_app: "publisher",
         rendering_app:,
         routes:,
@@ -97,5 +98,9 @@ def major_change?
     def public_updated_at
       edition.public_updated_at || edition.updated_at
     end
+
+    def last_edited_by_editor_id
+      edition.creator.uid
+    end
   end
 end

test/unit/presenters/formats/edition_format_presenter_test.rb

@@ -29,6 +29,7 @@ def result
       edition.stubs :latest_change_note
       edition.stubs :auth_bypass_id
       edition.stubs :exact_route?
+      edition.stubs creator: FactoryBot.build(:user)
 
       artefact.stubs :language
     end
@@ -160,5 +161,12 @@ def result
       expected = { auth_bypass_ids: %w[foo] }
       assert_equal expected, result[:access_limited]
     end
+
+    should "[:last_edited_by_editor_id]" do
+      uid = SecureRandom.uuid
+      user = FactoryBot.build(:user, uid:)
+      edition.expects(:creator).returns(user)
+      assert_equal uid, result[:last_edited_by_editor_id]
+    end
   end
 end