This PR implements pytest with nbmake in our CI pipeline to more reliably test the notebooks and allow for more granular notebook cell testing in the future. GitHub actions has also been improved to show JUnit tests directly in the GitHub Actions UI + upload an HTML report as artifacts to the workflow.

Things to note:

• ruff was updated as per the extra dependencies added to pyproject.toml. As a result, files have been formatted according to the updated standards for the newest version.
• Added a pre-commit hook to ensure that files are formatted using ruff before pushing to the repo, rather than later where the CI pipeline performs the check after the commit has already made it to the repo, ultimately wasting time, compute resources, and mucking up commit history to fail downstream rather than upstream. There is no way to force a user to install a pre-commit hook (although adding to the makefile makes this more seamless), so we should still leave the ruff formatting check in the CI pipeline.