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

@@ -661,9 +661,7 @@ describe('Google GenAI integration', () => {
     spans: expect.arrayContaining([
       expect.objectContaining({
         data: expect.objectContaining({
-          [GEN_AI_INPUT_MESSAGES_ATTRIBUTE]: JSON.stringify([
-            { role: 'user', content: [{ type: 'text', text: longContent }] },
-          ]),
+          [GEN_AI_INPUT_MESSAGES_ATTRIBUTE]: JSON.stringify([{ role: 'user', parts: [{ text: longContent }] }]),
           [GEN_AI_INPUT_MESSAGES_ORIGINAL_LENGTH_ATTRIBUTE]: 1,
         }),
       }),