Fix `clean` method in `DistributedRepository`

[JeongHunP]

1, clean method does not remove past tags, so fix it to remove tags attached to the branch of the previous blocks. 2. Looking at https://github.com/postech-dao/simperby/blob/main/repository/src/interpret/works.rs#L261, this method tries to checkout already removed branch which results in not found error. You can see this method tries to remove the branch right above line 261.