Improve reference URLs/breadcrumbs within individual work items

Challenge

• What information do users expect to see within the tree view in terms of origin and location of work items?
• How might we make best use of the real estate we have within these items in the tree without overwhelming users?
• Are these breadcrumbs? What are they?

Instances for review

• Epic tree
• Roadmap

Epic tree	Roadmap

Competitive analysis

To be completed in https://gitlab.com/gitlab-org/gitlab-design/-/issues/1530

Proposal

TBD

Resources & documentation

• 🔖 Documentation issue
• 🔍 Research issue: https://gitlab.com/groups/gitlab-org/-/epics/5214