Improve cluster information for backend

[vyncent-t]

Describe the issue

Currently we do not have a way to preserve the original name that a cluster is created with, this has been agreed on that there should be an additional field added to the kubeconfig contexts extension "headlamp_info" (contexts[context].extensions[extension][headlamp_info])

• This change is required in order to continue working on the feature that allows us to delete non dynamic clusters
• This change is also needed to fix issues relating to cluster naming (clusters that share the same name, renaming clusters)

Are you able to fix this issue?

Yes, currently working on a fix.

Additional Context

This comment was the introduction to this PR #2567 (comment)