Summary of changes:
- Update the charmcraft.yaml file to use base and platforms, only
allowing noble support.
- Update config to default to caracal.
- Update osci.yaml to use the charmcraft 3.x/beta
- Drop non-noble tests
- Update constraints file from -2024.1.txt to -noble.txt
- Add charmbuild to .zuul.yaml
- Add 'parts' section to charmcraft.yaml
Change-Id: I502455aff4864bcda16a80c5bf6fbd04acf7d719