[RFE] - The ability to allow passing in any ChartValues override.

[shabazzfsher]

Request Description:
The customer requires the implementation of a new RFE to facilitate the inclusion of ChartValues overrides. This requirement surfaced during the process of enabling metrics for CoreDNS, where a specific constraint was identified in lines 51 and 58 of the cluster.yaml file within the helm chart. The solution should permit the insertion of override values to enhance the flexibility of built-in charts.

Additionally, the customer suggests extending this functionality to address issues related to the kubectl image requirements observed in some deployments. The customer believes that these issues are predominantly associated with Rancher rather than RKE2. This enhancement aims to improve configuration capabilities in downstream clusters.

https://github.com/rancherfederal/rancher-cluster-templates/blob/main/charts/cluster-templates/templates/cluster.yaml#L51