Publish Helm Chart as OCI Artifact

### Description

As helm added support for packaging charts as OCI artifacts, more and more charts have moved over.

I am running a self-hosted pull-through OCI registry cache in my environment, both at home and at work. Having the AirFlow chart published as OCI artifact as well would simplify and improve similar configurations.

### Use case/motivation

I want to have this chart as an OCI artifact so that it can integrate with OCI registries and so I do not have to run a helm registry mirror as well.

I am currently running [this repo](https://github.com/mirceanton/charts-mirror/blob/main/apps/mlflow/metadata.yaml) which mirrors the AirFlow HTTP helm chart to an OCI package under my own account: https://github.com/mirceanton/charts-mirror/pkgs/container/charts-mirror%2Fairflow

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)