[exporter/humio] Don't rely on [SpanKind|StatusCode].String method #16018
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Don't rely on the [SpanKind|StatusCode].String() for spans encoding as Humio events. The method is not supposed to be used for this purpose.
This PR is one of prerequisites for updating output of the [SpanKind|StatusCode].String() method without breaking functionality of its consumers open-telemetry/opentelemetry-collector#6250