refactor: vendor deprecated incubator/raw chart

Background

We use incubator/raw because we want to define extra resources that a chart doens't provide, and since helmfile always needs a helm chart.

Using a deprecated chart is not a problem, but it might be remove from artifact hub which would cause failures in our applies.

Solution

Vendor the chart to what we did for gitlab-com so that it's always available and we don't depend on external deprecated resources.

reference https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/13973