Allow /copy_metadata for new issues

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50181

app/services/quick_actions/interpret_service.rb

@@ -290,7 +290,6 @@ module QuickActions
     end
     params '#issue | !merge_request'
     condition do
-      issuable.persisted? &&
       current_user.can?(:"update_#{issuable.to_ability_name}", issuable)
     end
     parse_params do |issuable_param|

changelogs/unreleased/toon-copy-meta-data-fix.yml

+---
+title: Allow /copy_metadata for new issues and MRs
+merge_request: 21953
+author:
+type: changed

spec/services/quick_actions/interpret_service_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe QuickActions::InterpretService do
@@ -859,6 +861,13 @@ describe QuickActions::InterpretService do
         let(:issuable) { issue }
       end
 
+      it_behaves_like 'copy_metadata command' do
+        let(:source_issuable) { create(:labeled_issue, project: project, labels: [inreview_label, todo_label]) }
+
+        let(:content) { "/copy_metadata #{source_issuable.to_reference}" }
+        let(:issuable) { build(:issue, project: project) }
+      end
+
       it_behaves_like 'copy_metadata command' do
         let(:source_issuable) { create(:labeled_issue, project: project, labels: [inreview_label, todo_label]) }