Fix author on new issues by /clone quickcommand

When creating a new issue using the `/clone` quickcommand, we should be
using the current user as author, not the author of the original issue.

app/services/issues/clone_service.rb

@@ -48,7 +48,7 @@ module Issues
         id: nil,
         iid: nil,
         project: target_project,
-        author: original_entity.author,
+        author: current_user,
         assignee_ids: original_entity.assignee_ids
       }
 

changelogs/unreleased/9421-fix-author.yml

+---
+title: Fix author on /clone quickaction usage to be current user
+merge_request: 49830
+author:
+type: fixed

spec/services/issues/clone_service_spec.rb

@@ -74,8 +74,8 @@ RSpec.describe Issues::CloneService do
           expect(new_issue.changed?).to be false
         end
 
-        it 'preserves author' do
-          expect(new_issue.author).to eq author
+        it 'sets the current user as author' do
+          expect(new_issue.author).to eq user
         end
 
         it 'creates a new internal id for issue' do