Backport #30943 by @Zettat123 Resolve #30917 Make the APIs for adding labels and replacing labels support both label IDs and label names so the [`actions/labeler`](https://github.com/actions/labeler) action can work in Gitea. <img width="600px" src="https://github.com/go-gitea/gitea/assets/15528715/7835c771-f637-4c57-9ce5-e4fbf56fa0d3" /> Co-authored-by: Zettat123 <zettat123@gmail.com>