[CI][ROCm] prune all stopped containers (#91815)
After #91740, stopped containers remained and consumed disk space. Avoid no space left on device errors by removing all stopped containers any time we stop them.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91815
Approved by: https://github.com/kit1980, https://github.com/ZainRizvi, https://github.com/huydhn
