Add response body fields

[Velfi]

Introducing the ResponseErrors selector in telemetry configurations to capture router response errors, allowing users to capture and log errors encountered at the router service layer. This new selector enhances logging for the router service, as it allows users the option to only log router errors instead of the entire router response body to reduce noise.

telemetry:
  instrumentation:
    events:
      router:
         router.error:
            attributes:
               "my_attribute":
                   response_errors: "$.[0]"
                   # Examples: "$.[0].message", "$.[0].locations", "$.[0].extensions", etc.

---

Checklist

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• PR description explains the motivation for the change and relevant context for reviewing
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• Changeset is included for user-facing changes
• Changes are compatible¹
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• Metrics and logs are added³ and documented
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  • Unit tests
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[apollo-librarian]

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