enhance: [2.4]update nightly ci (#36423)

https://github.com/milvus-io/milvus/pull/37080

1. enhance: send email to qa when nightly ci failure

Signed-off-by: Yellow Shine <sammy.huang@zilliz.com>

ci/jenkins/Nightly2.groovy

@@ -145,4 +145,13 @@ pipeline {
             }
         }
     }
+    post {
+        unsuccessful {
+            container('jnlp') {
+                script {
+                    sendEmail.toQA()
+                }
+            }
+        }
+    }
 }