Deprecated helm chart

When running our Github actions in preview mode, we are getting an error that is preventing the pipeline to go through.

We are getting the following error:
Error: looks like "https://storage.googleapis.com/chartmuseum.jenkins-x.io" is not a valid chart repository or cannot be reached: failed to fetch https://storage.googleapis.com/chartmuseum.jenkins-x.io/index.yaml : 403 Forbidden

This is caused by a deprecated helm chart. We should update this line:
https://github.com/nuxeo/nuxeo-elements/blob/maintenance-3.0.x/.github/workflows/preview.yaml#L92

to:
https://github.com/nuxeo/nuxeo-elements/pull/464/files#diff-22da830e02ef5bed54ecad981722fd9c940aec797740c09927d4a904df0bccd6R92

We should probably also need to add a new helm chart for exposecontroller:

helm repo add exposecontroller hghcr.io/jenkins-x/exposecontroller

After applying this changes, we are getting an error on updating helm dependencies, that we need to investigate: https://github.com/nuxeo/nuxeo-elements/blob/maintenance-3.0.x/.github/workflows/preview.yaml#L99