Add general debugging advice for triage-ops in RUNBOOK
Context
Follow-up item of this postmortem: https://gitlab.com/gitlab-org/quality/contributor-success/team-task/-/issues/129#note_1217230849
What's in this MR?
Edited by David Dieulivol
Follow-up item of this postmortem: https://gitlab.com/gitlab-org/quality/contributor-success/team-task/-/issues/129#note_1217230849