Reviving K6's StatsD Extension for Datadog Observability

K6 v0.55.0 removed StatsD output, making it harder to send load test metrics into Datadog.

After evaluating alternatives and losing key percentiles like p95, the author used xk6 to rebuild K6 with the StatsD extension restored.

The custom binary was packaged into a Docker image, published on Docker Hub, and the internal build details were shared with the client.

This restores Datadog-compatible K6 metric collection and keeps load testing data in the existing observability workflow.