Previously this behaviour was only available to group
and instance-level clusters, as some project clusters
relied on Kubernetes credentials being passed through
to the runner instead of having their resources managed
by GitLab (which is not available when using JIT). These
clusters have been migrated to unmanaged, so resources
can be created on demand for the remaining managed clusters.
- Add pages javascripts to intialize clusters for group pages
- Move specs asserting gcp specific validations from controller into
UpdateService spec
- Also teach Clusters::ApplicationController about groups
This enables us to have other options in the future such as passing in
`group:`.
Also, remove project arg from UpdateService, as un-used.
This will help group cluster controller to re-use this services.
