Use new changelog approach for CNG and Helm
As part of #1551 (closed), Omnibus will be using the new changelog approach. We also need to switch over CNG and Helm.
As these projects are largely maintained by the same people, an extra testing period is unnecessary. Instead, we need to update whatever review tooling is in place to start requiring developers to use the new approach per the 22nd.
Things we would have to adjust:
- Danger or similar tooling used during the review process
- Set up a push rule to deny new YAML files being added
- Remove existing YAML files, optionally turning them into changelog commits (if needed)
Edited by Yorick Peterse