Background
linkerd install control-plane currently checks for namespace existence. With #2765, there now exists an entire category of checks, LinkerdConfigChecks, specifically for validating successful installation of linkerd install config. This includes checking for namespace, RBAC, and CRD resources.
Proposal
Modify linkerd install control-plane to run all checks in the LinkerdConfigChecks category.
Motivated by: #2772 (comment)