Fix for TestWrite6Files and TestWrite5FilesWithArray

[Fluder-Paradyne]

Background

TestWrite5FilesWithArray when mocked will place 5 files inside the input folder and looks for those file in the output folder so this mock always fail

Changes

Move all artifacts_in to artifacts_out and move test.py from artifacts_out to custom_python

PR Quality Checklist

• [ ] I have run the following commands against my code to ensure it passes our linters:

  black . --exclude test.py
  isort .
  mypy .
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring --in-place agbenchmark