[Website]: Create or update Java tutorial to use Elastic Agent

### Type of issue

Missing information

### What documentation page is affected

https://www.elastic.co/docs/solutions/observability/applications/tutorial-monitor-java-application

### What happened?

It is confusing as to what is the current recommended way to monitor a Java application in v9.0. The docs seem to recommend going with EDoT over Elastic APM agent and use (Fleet managed) Elastic Agent for logs and metrics. Yet, this tutorial is still using Filebeat and Metricbeat with Elastic APM agent.

### Additional info

Other sections of the documentation recommend Elastic Agent managed by Fleet as the best way to ingest O11y (logs and metrics) data. However, the tutorial for Java is still using Filebeat and Metricbeat.

I can understand the tutorial may not be updated for OTel as portions of it are still in tech preview as of [8.18](https://www.elastic.co/guide/en/observability/8.18/apm-open-telemetry.html#apm-otel-elastic-distros).

All of the recent [APM articles](https://www.elastic.co/observability-labs/blog/tag/apm) on O11y labs site are all OTel related.

It feels like the tutorial is out of date or has not been updated recently.