[load-generator] Tasks fail with missing `tracer` attribute

[sirianni]

Bug Report

Which version of the demo you are using?
ghcr.io/open-telemetry/demo:2.1.3-load-generator

Symptom

Load Generator tasks are all failing with

AttributeError("'WebsiteBrowserUser' object has no attribute 'tracer'")

OTEL_* env vars are configured properly on the pods and I'm seeing metrics and traces for it in my backend.

[Khodunov]

I'm getting the same problem, downgrading to app version 2.0.2 helped (corresponding chart version is 0.37.8)