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
Change-Id: I9c2427a8dcd4c06a2f1f41ecf5295b0605d4b04f
1166f9e7dc