When this option is enabled, GitLab will create namespaces and service
accounts as usual. When disabled, GitLab wont create any project
specific kubernetes resources
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/56557
JIT resource creation blocks deployments if a user is
self-managing their cluster, as it will fail the build
if unable to create a namespace and service account.
Using a custom namespace and service account was previously
supported for project level clusters, so we should preserve
this functionality.
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27352
