When onboarding, have a service label assigned and added to the common label set

Requirement questions:
- Where is this common label set?
- Do they apply to all repositories? if not, which ones?
- Who should be in charge of creating this labels? The partner teams? do they have permissions?
- Are the labels per service or per product name?
- Do the names match Service Tree? or are these arbritary names?
- What happens if the name of the team changes? how is this handled?

The issue names no files, tests, or entry points. Start by resolving the listed requirements: where the common label set applies, who creates labels, whether names are services or products, how names relate to Service Tree, and how renames are handled. Done means these decisions are documented as an agreed implementation scope.

Written by the indexing model from the issue text.