Change the `metrics:start_time` job name to `prepare`
What does this MR do?
Since the job now also posts a note to the monthly issue when the
package contains post-deploy migrations, we can no longer call this
job metrics:start_time.
gitlab-com/gl-infra/delivery#2224 (closed)
Author Check-list
- [-] Has documentation been updated?
Edited by Mayra Cabrera