ref(tracing): Only send user_id if sendDefaultPii is true

Author: Lms24

packages/tracing/src/transaction.ts

@@ -237,7 +237,7 @@ export class Transaction extends SpanClass implements TransactionInterface {
         environment,
         release,
         transaction: this.name,
-        user_id,
+        ...(hub.shouldSendDefaultPii() && { user_id }),
         user_segment,
         public_key,
         trace_id: this.traceId,