Investigate GitHub generated release notes

There's an API we can use to add notes to a release. The output can be customized using a config file.

https://docs.github.com/en/rest/releases/releases?apiVersion=2022-11-28#generate-release-notes-content-for-a-release

We currently use an action - https://github.com/knative/actions/blob/main/.github/workflows/release-notes.yaml to generate them but they are manually applied on the release

Start by reading .github/workflows/release-notes.yaml and the linked GitHub generate-release-notes API documentation. Determine how the API and its configuration could replace the current manual application of action output; done means the release process applies generated notes without that manual step.

Written by the indexing model from the issue text.