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Implement utilityChatCompletion in CopilotApiService (#318495)

* feat: Implement utilityChatCompletion in CopilotApiService and add integration tests

* fix: Update comments and improve caching logic in CopilotApiService integration tests
D
Don Jayamanne committed
26835ca4876f10165db5922b01d61524eda9f855
Parent: ffe6e9a
Committed by GitHub <noreply@github.com> on 5/27/2026, 6:03:45 PM