Test spans for `otel.scope.*` attributes

Exporters should be adding the instrumentation scope to spans as `otel.scope.*` attributes: https://github.com/GoogleCloudPlatform/opentelemetry-operations-go/blob/d637680bde0cb1e4d06117621478e5ac281ff556/exporter/collector/integrationtest/testdata/fixtures/traces/traces_basic_expected.json#L112C1-L121C17

Implement here and make sure repos are passing.