[orchestrator]: Investigate zombie process during Client Workflow Workflow

Somethings is causing the collector to become a Zombie process during Russula client worker workflow

We can detect the zombie process and continue with Russula shutdown, which causes the process to be killed. This indicates that Russula is possibly preventing a clean close of the collector.

```
root 54245 Sl ./target/debug/russula_cli --protocol NetbenchClientWorker --port 9000 --peer-list 54.198.168.151:4433
root 54688 Z [netbench-collec]
```

Reproduce the Russula client worker workflow using the shown russula_cli command and observe the collector during shutdown. Trace why the collector remains as a defunct process; done means Russula shuts down without leaving a zombie collector.

Written by the indexing model from the issue text.