Use conventions constant in decide test assertions

Author: andreiborza

packages/server-utils/test/integrations/vercel-ai/decide.test.ts

@@ -1,4 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import { GEN_AI_OUTPUT_MESSAGES } from '@sentry/conventions/attributes';
 import { GEN_AI_DECIDE } from '@sentry/conventions/op';
 import { getMainCarrier, setCurrentClient, spanToStaticSpanJSON } from '@sentry/core';
 import type { Span } from '@sentry/core';
@@ -51,7 +52,7 @@ describe('Vercel AI decide spans', () => {
     const json = spanToStaticSpanJSON(endedSpans[0]!);
     expect(json.description).toBe('decide typesafe-ai/jev');
     expect(json.op).toBe(GEN_AI_DECIDE);
-    expect(JSON.parse(json.data?.['gen_ai.output.messages'] as string)).toEqual([
+    expect(JSON.parse(json.data?.[GEN_AI_OUTPUT_MESSAGES] as string)).toEqual([
       { type: 'evaluation', answers: { wantsRefund: { type: 'boolean', probability: 0.99 } } },
     ]);
   });
@@ -78,7 +79,7 @@ describe('Vercel AI decide spans', () => {
     span.end();
 
     const json = spanToStaticSpanJSON(endedSpans[0]!);
-    expect(JSON.parse(json.data?.['gen_ai.output.messages'] as string)).toEqual([
+    expect(JSON.parse(json.data?.[GEN_AI_OUTPUT_MESSAGES] as string)).toEqual([
       { type: 'evaluation', answers: { department: { type: 'choice', choice: 'billing', confidence: 0.91 } } },
     ]);
   });