Allow to reset the entire environment of Studio Lab

**Is your feature request related to a problem? Please describe.**
When the students use the Studio Lab in the lecture, they often forget to create an isolated environment for the lecture, install all the packages to default environment. We can’t delete the default environment, for that reason wasted default environment consume the storage.

**Describe the solution you'd like**
Allow the teachers to guide the students as following.

1. Reset the entire environment
2. Execute the right procedure from the first.

**Describe alternatives you've considered**
We can rollback the conda environment by #42 . But this procedure only rollback the conda packages, pip packages are not rollbacked.

**Additional context**
(none)