fix(tracing): Add missing attributes in vercel-ai spans (getsentry#18333)

Also, sort the fields in the integration test, in order to more easily
se which fields were missing/misnamed in the fixture objects.

Fix JS-1216
Fix JS-1236

Author: isaacs

dev-packages/node-integration-tests/suites/tracing/vercelai/test-generate-object.ts

@@ -24,7 +24,7 @@ describe('Vercel AI integration - generateObject', () => {
           'gen_ai.usage.input_tokens': 15,
           'gen_ai.usage.output_tokens': 25,
           'gen_ai.usage.total_tokens': 40,
-          'operation.name': 'ai.generateObject',
+          'gen_ai.operation.name': 'ai.generateObject',
           'sentry.op': 'gen_ai.invoke_agent',
           'sentry.origin': 'auto.vercelai.otel',
         }),
@@ -38,7 +38,7 @@ describe('Vercel AI integration - generateObject', () => {
         data: expect.objectContaining({
           'sentry.origin': 'auto.vercelai.otel',
           'sentry.op': 'gen_ai.generate_object',
-          'operation.name': 'ai.generateObject.doGenerate',
+          'gen_ai.operation.name': 'ai.generateObject.doGenerate',
           'vercel.ai.operationId': 'ai.generateObject.doGenerate',
           'vercel.ai.model.provider': 'mock-provider',
           'vercel.ai.model.id': 'mock-model-id',