Design for aggregation insights: display "grouped" insights for existing searches

[Joelkw]

Refer to the Scope RFC as the source of truth for the scope.

Implementation issue: https://github.com/sourcegraph/sourcegraph/issues/39246

Design process (Size: M)

• Estimate: Two weeks (we will try to shorten the timeline and work in pararel with engineering)
• Weighting factors:
  • MEDIUM risk
  • MEDIUM clarity

Discover

• RFC
• Existing customer feedback - Link
• Internal users - Link
• External users - Link, Link

Define

• Product document or RFC
• Github issue

Design

• Wireframes, Loom
• High fidelity design using design system - [Figma],(https://www.figma.com/file/cKSeCtmBh9aiPsAVoKsLgM/Aggregation-insights%3A-display-%22grouped%22-insights-for-existing-searches-%2339126?node-id=246%3A11) Loom
• Prototype
• Designer review
• Final Loom

Testing

• Hallway testing - Link
• Showing the solution to the customers (TBD)

Deliver

• Announce in #progress
• Loom - Link
• Team review
• Design team review
• QA - Link

Measure

• Metrics defined in the Figma file (i) - in review
• Followup task will analyze metrics to ensure successful completion - Link

[sourcegraph-bot-2]

Heads up @Joelkw @felixfbecker @vovakulikov @unclejustin - the "team/code-insights" label was applied to this issue.

[AlicjaSuska]

@Joelkw I've added need-design label and assigned myself since some design work is needed for this one.