Require that all sev2 and sev1 user-facing incidents have service, rootcase and correctiveaction labels
As a followup to the discussion in https://gitlab.com/gitlab-com/gl-infra/mstaff/-/issues/189#note_1329026770, I suggest that if a user-facing sev2 or sev1 incident goes x days (7?) without any activity and without a linked corrective action, we mention the DRI until a corrective action is added, or a special label is added `NoCorrectiveActionNeeded`.
In addition to corrective actions, I suggest we expand this to our [required labels](https://about.gitlab.com/handbook/engineering/infrastructure/incident-management/#required-labeling)
## Proposal
- [x] Clarify section on [required labels](https://about.gitlab.com/handbook/engineering/infrastructure/incident-management/#required-labeling) https://gitlab.com/gitlab-com/www-gitlab-com/-/merge_requests/126420
- [x] Create Triage-ops Rule that adds a note with DRI mention (plus others) if a `Needed` label is present for N days. https://gitlab.com/gitlab-com/gl-infra/triage-ops/-/merge_requests/191
issue