Relates to #54.

Previously we went to some length to disable jobs using the common job
rules from running in push pipelines if there is an open MR. As noted
in #54, this is sub-optimal since the Auto DevOps container scanning
jobs, etc only run in push pipelines.

As such, let the upstream user of the jobs decide on their own workflow
rules policy because they are the best placed to decide if they care
about Auto DevOps jobs.