[TEST] Move .test_data content to dvc

[AlexVCaron]

Type of improvement

If submitting a new module or fixing a bug, please use the appropriate template.

• [ ] Documentation
• [x] Development tools (e.g. linter, formatter, etc.)
• [ ] Development container
• [ ] Global update (please specify)
• [ ] Other (please specify)

Describe your improvement

Move legacy test_data content to DVC. Have not removed the directory yet, @gagnonanthony will make the changes in is various nf-test transition PRs.

Checklist before requesting a review

• [x] Ensure the syntax is correct (EditorConfig and Prettier must pass)
• [x] Run the test suites if your changes affect any module
• [x] Regenerate the Poetry lock file if you have updated the dependencies
• [ ] Ensure the documentation is up-to-date