improved port-forward error reporting (#4155)

Signed-off-by: Jim Ehrismann <jehrismann@mirantis.com>

src/main/routes/port-forward-route.ts

@@ -94,6 +94,10 @@ class PortForward {
       }
     });
 
+    this.process.stderr.on("data", (data) => {
+      logger.warn(`[PORT-FORWARD-ROUTE]: kubectl port-forward process stderr: ${data}`);
+    });
+
     const internalPort = await getPortFrom(this.process.stdout, {
       lineRegex: internalPortRegex,
     });