Fix test assertion to use Google GenAI parts format instead of content format

Author: andreiborza

dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

@@ -662,7 +662,7 @@ describe('Google GenAI integration', () => {
       expect.objectContaining({
         data: expect.objectContaining({
           [GEN_AI_INPUT_MESSAGES_ATTRIBUTE]: JSON.stringify([
-            { role: 'user', content: [{ type: 'text', text: longContent }] },
+            { role: 'user', parts: [{ text: longContent }] },
           ]),
           [GEN_AI_INPUT_MESSAGES_ORIGINAL_LENGTH_ATTRIBUTE]: 1,
         }),