Adjust ~missed-SLO policy for ~bug to use severity labels
Proposal
As a part of #400 (closed), SLO definition for ~bug will be changed to rely on severity labels instead of priority labels.
This issue will capture the updates to https://gitlab.com/gitlab-org/quality/triage-ops/-/blob/master/policies/stages/hygiene/label-missed-slo.yml based on that change.
Edited by Dan Jensen