Ensure `make clean` does indeed clean or it will fail out.

[sfc-gh-dkurokawa]

Description

Ensure make clean does indeed clean or it will fail out.

Also removed an extra dependency to openai in a test that wasn't necessary.

Other details good to know for developers

During a release, I noticed you could get away without cleaning things which we probably shouldn't allow. Also there was some issue with the test environment (hence my removing of the openai thing).

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] New Tests
• [ ] This change includes re-generated golden test results
• [ ] This change requires a documentation update

---

[!IMPORTANT] Ensure make clean in Makefile performs a clean operation and remove unnecessary openai import from test_context_variables.py.

• Makefile:
  • Modify clean target to exit with a message if the user chooses not to clean.
• Tests:
  • Remove unnecessary openai import from test_context_variables.py.

^{This description was created by for 34a8cb5077ba943df57e890d190d7e3d41a63f47. It will automatically update as commits are pushed.}