Checkmk Werk 15278: synology_disk: read disk health status

ID: 15278 Title: synology_disk: read disk health status Component: Checks & agents Level: 1 Class: Bug fix Version: 2.3.0b1 A Failing disks would report a working file system (as the file system was still readable) but still needs to be replaced. The check was extended to also report disk health status which was introduced with DSM 7.1. Also split the summary, remove duplicated temperature text, and remove text about temperature levels, as no temperature levels can be defined for this service.