Adjust the auto-deploy schema to be utilized by CNG
- When release-tools starts sending auto-deployt ags to CNG, they will not be the same as the tag that is sent to omnibus
- Previously the thought was that we'd carry the same tag downward to CNG, but this has been determined it'll cause confusion
- Instead we'll send a tag that only represents the timestamp and sha of gitlab at the time of tagging
- This commit lobs off the
omnibus sha
portion that was originally proposed
Addresses: gitlab-com/gl-infra/delivery#693 (closed)