Lunny Xiao e2f365b55c
Display head branch more comfortable on pull request view (#32000)
This PR do some minor improvements for head branch display on pull
request view UI.

- [x] Remove the link if the head branch has been deleted with a
tooltip, so that users will not result in a 404 page
- [x] Display a label if this pull request is an agit based one.

![图片](https://github.com/user-attachments/assets/872f26b6-f1cf-4427-9e41-e3a5b176dfa4)
2024-09-24 04:14:57 +00:00
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