'Connect a cluster' button visible yet dysfunctional at group level

Summary

The Kubernetes cluster agent page rendered at group level shows a Connect a cluster button which redirects to 404 page not found.

Steps to reproduce

1. Navigate to a GitLab.com group
2. Select: Operate > Kubernetes to be taken to /groups/<group name>/-/clusters
3. Observe and click the Connect a cluster button, you will be redirected to groups/<group name>/-/clusters/new_cluster_docs

What is the current bug behavior?

I suspect this is due ultimately to the deprecation of the certificate based integration where group level clusters existed?

Clicking the button redirects to a non-existent documentation page.

What is the expected correct behavior?

The button should either be removed, or direct you to the correct documentation location for registering an agent at the project level.