Provide a way for GitLab.com users to debug Kubernetes errors

See https://gitlab.com/gitlab-org/gitlab-ce/issues/55362#note_136262494

Problem

When certain Kubernetes operations are run by the GitLab rails application, such as creating namespace or service accounts or creating pods, users can only see limited error information on the UI. Our docs then direct them to kubernetes.log but on GitLab.com they won't have access to that log.

Example error currently seen by users:

 Something went wrong while installing Helm Tiller

    Kubernetes error: 404

Further details

Note that when a Kubernetes operation is run in an install pod (e.g. installing Helm in install-helm pod), the user can query the pod logs which is feasible.

Proposal

Unsure at the moment. Needs a way where a non-administrator can access more information