chore(server): splitting trace poller in multiple queues

[danielbdias]

This PR breaks the trace poller logic into three phases: start, fetch and evaluate. Each step has its own worker now on package executor/tracepollerworker.

The old trace poller code still exists and will be removed in future versions.

Loom: https://www.loom.com/share/0bcb3cf33c0b472f993c7e891af78361

Changes

• Added executor/tracepollerworker package
• Updated dogfooding tests to consider the three phases
• Fixed some race conditions that were causing trace poller to crash

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test