### What problem does this PR solve?

Improve usability of Node.js/JavaScript code executor.

### Type of change

- [x] Refactoring

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
Co-authored-by: writinwaters <93570324+writinwaters@users.noreply.github.com>

### What problem does this PR solve?

Add sandbox FAQ. 

#7699 #7973 #8049 #8196 #8226.

### Type of change

- [x] Documentation Update
- [x] Refactoring

### What problem does this PR solve?

Add code_executor_manager. #4977.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)