Common Service Account Won't be created with Tag versions after 13.2.2-bb.7

Common service account gets created on 13.2.2-bb.7, however when attempt to upgrade to any of the following versions, it cannot be created by the chart, and pods fail with service account <sa_name> not found error. This might be because of the removal of the serviceaccount.yaml file in templates with this MR. As a workaround, enabling the service account under query creates the service account in thanos namespace, and the pods can use that same service account. @steven.donald @kliu @jimmyungerman @piotr.machaj @blairbowden @w.griffing