fix: Unpack vendored charts

What does this MR do?

Fixes Error: only unpacked charts can be updated:

https://staging.gitlab.com/hello-staging/hello-staging-cluster-management/-/jobs/37956703

All I did was tar -xvf each chart

Related issue: gitlab-org/gitlab#220141 (closed)

Screenshots

Manual QA

Tested successfully on https://staging.gitlab.com/hello-staging/hello-staging-cluster-management/-/jobs/37956727

• Test this change using a Cluster management project