Build cleanup and housekeeping

[lcarcaramo]

• Update setup.py to make the assembly step for irrseq00.s more robust.
• Ensure the Jenkinsfile properly cleans up unit test artifacts.
• Use dynamic version so that we don't need to automatically update the git tag?
  • https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#static-vs-dynamic-metadata