Remove branch in a closed merge request
- If a closed merged request's source branch still exists, close it.
- Use the same design as removing a branch for merged merge request, i.e.:
Usually we select the option to remove a branch upon merge which works create if the merge request was accepted but is totally ignored in the rare situation when a merge request was rejected (closed).
Add a button after close to allow the removal of the branch similar to the existing solution when merging a branch. The button can be displayed independent to the setting of the removal option.