Improve the test_setup script in Makefile to prevent accidental deletion

[siddhant-deepsource]

The test_setup recipe in Makefile has a step: cd ${CODE_PATH} && ls -A1 | xargs rm -rf which can accidently delete some significant directories if CODE_PATH is not configured.

[akshayamadhuri]

i think to prevent this issue it is recommended to either set the CODE_PATH environment variable to a safe value before running the test_setup recipe, or to modify the recipe so that it only deletes specific files or directories that are not needed for the test. Additionally, you may want to add a check in the recipe to ensure that the CODE_PATH environment variable is set to a non-empty value before proceeding with the deletion step.

[vishnu-deepsource]

We should add unit tests. Closing this in favour of #241