Merge pull request #50948 from mengqiy/add_junit_location

Automatic merge from submit-queue

output junit report dir in cmd test

Output junit report dir for easier debug locally, otherwise people need to dive into the code to find the junit report dir. This will save people's time.

```release-note
None
```

hack/make-rules/test-cmd-util.sh

@@ -173,6 +173,9 @@ function cleanup()
   kube::etcd::cleanup
   rm -rf "${KUBE_TEMP}"
 
+  local junit_dir="${KUBE_JUNIT_REPORT_DIR:-/tmp/junit-results}"
+  echo "junit report dir:" ${junit_dir}
+
   kube::log::status "Clean up complete"
 }