Change the auto-deploy tag recognition

• Perviously we were going to send our omnibus sha with our tag which wouldn't make sense in the case of helm charts or CNG builds. A decision was made in gitlab-com/gl-infra/delivery#693 (closed) to shorten the tag being utilized to only the major, minor, time stamp + gitlab sha
• This will allow the Delivery team to concnetrate on a more future proof version of tagging without blocking the need to enable auto-deploy
• This tag is still very unique as the timestamp is at the minute granularity

Help address: gitlab-com/gl-infra/delivery#623 (closed)