Vendor `raw` chart into repo

What does this MR do?

Part of gitlab-com/gl-infra/delivery#1982 (closed)

In order to allow us to eventually drop helm-git, as well as remove external depedencies and help readability, we are moving external charts to be vendored in repo.

As the raw chart is currently being hosted on the incubator repository that is locked (no more changes), we can easily move this in repo completely (no need to track it upstream using git subtree, as it will never change).

Author Check-list

Please read the Contributing document and once you do, complete the following:

• Assign to the correct reviewer per the contributing document
• Apply the correct metadata per the contributing document
• Link to related MRs for applying the changes on other environments
• Link to related Chef changes
• If necessary link to a Criticality 4 Change Request issue

Reviewer Check-list

• Reviewed the diff jobs to confirm changes are as expected
• No changes shown in the diffs not associated with this MR - This may require a rebase or further investigation