Update Cache Error Message for Improved Clarity

[aparnajyothi-y]

Description: This PR updates the error messag for pip and pipenv to provide clearer information when the cache folder path is retrieved but does not exist on disk. This enhancement aims to improve troubleshooting by specifying the package manager and the exact paths being checked.

Related issue: #436

Check list:

• [ ] Mark if documentation changes are required.
• [ ] Mark if tests were added or updated to cover the changes.