Change the scheduled delay config to send all spans before the tests are finished in the 08_opentelemetry exercise

[tofu511]

Hi!

The 08_opentelemetry exercise has an issue with sending spans to HoneyComb. When I looked into the issue, the tests seemed to finish before the batch exporter exported all spans to HoneyComb since the batch exporter had a 5-second scheduled delay by default.

This problem may be solved using install_simple instead of install_batch. However, install_simple isn't usable due to this issue, so I think it would be better to change the scheduled delay to improve the workshop experience.

[karlskewes]

Thanks for this. Works for me.
Alternatively we would need to construct the OTEL components separately and make the batch span exporter available in tests to call bsp.force_flush().