TUN-7146: Avoid data race in closing origin connection too early

Author: nmldiegues

proxy/proxy.go

@@ -288,22 +288,14 @@ func (p *Proxy) proxyStream(
 		return err
 	}
 	connectSpan.End()
+	defer originConn.Close()
 
 	encodedSpans := tr.GetSpans()
 
 	if err := rwa.AckConnection(encodedSpans); err != nil {
 		return err
 	}
 
-	streamCtx, cancel := context.WithCancel(ctx)
-	defer cancel()
-
-	go func() {
-		// streamCtx is done if req is cancelled or if Stream returns
-		<-streamCtx.Done()
-		originConn.Close()
-	}()
-
 	originConn.Stream(ctx, rwa, p.log)
 	return nil
 }