Backport: docs(observability): add Sentry (#9128)

This is an automated backport of #9080 to the release-v5.0 branch.

Co-authored-by: Sergiy Dybskiy <s@serg.tech>

Author: vercel-ai-sdk[bot]

content/providers/05-observability/index.mdx

@@ -17,6 +17,7 @@ Several LLM observability providers offer integrations with the AI SDK telemetry
 - [Maxim](/providers/observability/maxim)
 - [HoneyHive](https://docs.honeyhive.ai/integrations/vercel)
 - [Scorecard](/providers/observability/scorecard)
+- [Sentry](https://docs.sentry.io/platforms/javascript/guides/nextjs/configuration/integrations/vercelai/)
 - [SigNoz](/providers/observability/signoz)
 - [Traceloop](/providers/observability/traceloop)
 - [Weave](/providers/observability/weave)