Realistic benchmarks: Improve app configs

[Zelldon]

What the PR does

• Adjusts the starter configuration, so extraBpmnModels can be correctly configured
• Adjusts the starter configuration, so we can set a different process ID
• Adjust the workers so we can configure/define whether messages should be published
• Add an example values file to configure the realistic benchmark

Example

Changes have be executed and deployed manually in our GKE.

Can be done via: $ helm install zeebe-benchmark charts/zeebe-benchmark/ --render-subchart-notes -f charts/zeebe-benchmark/values-realistic-benchmark.yaml

You can port-forward to Operate to see process instances being executed kubectl port-forward svc/zeebe-benchmark-operate 8081:80

Furthermore, look at the Camunda Performance dashboard to observe the performance.