feat: add topic-based attribution support to HighImpactPromo component

[LukasFrm]

Resolves JIRA: https://bbc.atlassian.net/browse/WS-1941

Changes

Update article content summary logic, models and components to use the new primaryTopic property provided by the backend.

Ensure filtering logic continues to exclude high-impact (MAXIMUM visualProminence) summaries unless they are media types.

Impact

Article summaries now expose a primaryTopic field, improving topic data availability for downstream consumers.
No impact expected for non-article summary types.

Testing

Run the application and fetch article content summaries.
Confirm that article summaries include a primaryTopic field populated from the backend.
Validate that summaries for non-article types are unaffected.

Developer Checklist

• UX
  • UX Criteria met (visual UX & screenreader UX)
• Accessibility
  • Accessibility Acceptance Criteria met
  • Accessibility swarm completed
  • Component Health updated
  • P1 accessibility bugs resolved
  • P2/P3 accessibility bugs planned (if not resolved)
• Security
  • Security issues addressed
  • Threat Model updated
• Documentation
  • Docs updated (runbook, READMEs)
• Testing
  • Feature tested on relevant environments
• Comms
  • Relevant parties notified of changes

Testing

• Manual Testing required?
  • Local (Ready-For-Test, Local)
  • Test (Ready-For-Test, Test)
  • Preview (Ready-For-Test, Preview)
  • Live (Ready-For-Test, Live)
• Manual Testing complete?
  • Local
  • Test
  • Preview
  • Live

Additional Testing Steps

1. List the steps required to test this PR.

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