Obsolete cache Tab in admin UI
Adding tab for obsolete cache actions (get list and delete)
![Screenshot from 2023-09-21 13-41-11](https://github.com/huggingface/datasets-server/assets/5564745/1e28eee6-e253-4aba-898b-f0e7f8cbb09e)

Obsolete cache Tab in admin UI: Adding tab for obsolete cache actions (get list and delete)
![Screenshot from 2023-09-21 13-41-11](https://github.com/huggingface/datasets-server/assets/5564745/1e28eee6-e253-4aba-898b-f0e7f8cbb09e)
