Updates the beyla golden signals sample, and uses the disable_informers and drop_external options. This reduces memory usage by half, and reduces CPU usage by > 90%. It also means we can get rid of our filter in the otel collector config. In a follow-up, we could replace the collector in this sample with the k8s-otlp-ingest one so we don't need to maintain it anymore here.

The routes unmatched: wildcard preserves existing behavior, which is to disable the route heuristics. It did seem to work well when I tried it with the OTel demo, but that can be removed separately.

There were a few typos in some samples, which i've fixed.

The beyla service graph sample needed the metric name "calls" updated to "traces.span.metrics.calls" because of an update to the collector component.