[Refactor:System] setup sample courses zip->shutil (#5072)
[Refactor:System] setup sample courses zip->shutil (#5072)

* Removed zip and used shutil

* Modified path to strings

* Made specific changes

* Commented import line for zip

* Done Specefic Changes Mentioned

* Updated setup_sample_courses.py

Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,Submitty/Submitty,Submitty/Submitty,RCOS-Grading-Server/HWserver,Submitty/Submitty,RCOS-Grading-Server/HWserver,RCOS-Grading-Server/HWserver,Submitty/Submitty