Improve documentation of stage, group, category, feature labels
What does this MR do?
- This documents better the current state of the stage, group, category, and feature labels, adding naming and color conventions.
- The "Subject labels" have been renamed "Feature labels".
- I've introduced "Facet labels" (e.g. security, database, master:broken, ~"technical debt" etc.) to add facets to an issue/MR.
- I've also added links to relevant pages in the handbook and triage operations pages.
Relates to gitlab-org/quality/triage-ops#245 (closed) and gitlab-org/quality/triage-ops#247.
This requires https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32056 to have a green pipeline.
Does this MR meet the acceptance criteria?
Conformity
Edited by Rémy Coutable