fix: use instrumentation schema URL on scope spans

Author: scottgerring

opentelemetry-proto/src/transform/trace.rs

@@ -192,7 +192,7 @@ pub mod tonic {
             .into_iter()
             .map(|(instrumentation, span_records)| ScopeSpans {
                 scope: Some((instrumentation, None).into()),
-                schema_url: resource.schema_url.clone().unwrap_or_default(),
+                schema_url: instrumentation.schema_url().map(ToOwned::to_owned).unwrap_or_default(),
                 spans: span_records
                     .into_iter()
                     .map(|span_data| span_data.clone().into())