This is an improvement to the benches in
https://github.com/open-telemetry/opentelemetry-rust-contrib/blob/main/opentelemetry-user-events-logs/benches/logs.rs

The behavior depends on whether a user-events listener is present or not. There is a code comment that shows how to enable/disable the listener.

Currently it's manually enabled/disabled and the tests are run and the results stored as comment based on that.

Task: Improve the benchmark, so that it enables/disables the user-event using the commands (echo..), and run the benches with enabled/disabled.

Modify the results (comment) with placeholder results.