Show expected cluster information on environment page
In order to make it simpler for people to understand how to use deploy boards we should show several pieces of information on the environment page that corresponds to the way GitLab expects this environment to make use of the cluster.
We should show:
- Which cluster will be used for a job now
- Which namespace will be used
- The expected annotations for pods deployed in such a job
- If managed cluster say that we will (or already have) created namespace and service account
- If unmanaged cluster mention that we won’t be creating this namespace