extend observability in zos and gridproxy using opentelemetry and jaeger

[xmonader]

Add OpenTelemetry + Jaeger instrumentation to ZOS and gridproxy, ensuring full end-to-end tracing across the system.

subtasks

• extend observability in zos using opentelemetry and jaeger #1597
• extend observability in gridproxy with opentelemetry and jaeger #1598

Deliverables

• Updated code with opentelemetry
• Jaeger dashboards showing two services
  • ZOS
  • GridProxy
• Documentation