[proccessor/spanmetrics] Don't rely on [SpanKind|StatusCode].String #16019
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Don't use [SpanKind|StatusCode].String() for getting attribute values as the method will likely be changed. Define the attribute values in place.
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