Added permission to list and get SAs in default rbac for gitlab-runner
Due to a change in GitLab Runner 15.0: gitlab-org/gitlab-runner!3399 (merged)
The role for the service account that GitLab Runner use needs a permission to list and get the service accounts.
This MR adds the new permission needed to prevent encountering this error: gitlab-org/gitlab-runner#29101 (closed)