add basic kas runbook
Adds the service catalog entry and basic runbooks for KAS (Gitlab Kubernetes Agent).
Part of https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/12333
Edited by Graeme Gillies
Adds the service catalog entry and basic runbooks for KAS (Gitlab Kubernetes Agent).
Part of https://gitlab.com/gitlab-com/gl-infra/infrastructure/-/issues/12333