[Improvement][Metrics] Filtering data by application in grafana-demo worker dashboard example (#13139)

* Filtering data by application in grafana-demo worker dashboard example
* Update dolphinscheduler-api/src/main/resources/swagger.properties

Co-authored-by: chunlai.xu <chunlai.xu@zhaopin.com.cn>
Co-authored-by: kezhenxu94 <kezhenxu94@apache.org>

Author: 3 people

dolphinscheduler-meter/src/main/resources/grafana/DolphinSchedulerWorker.json

@@ -179,7 +179,7 @@
             "type": "prometheus",
             "uid": "PBFA97CFB590B2093"
           },
-          "expr": "process_start_time_seconds{}",
+          "expr": "process_start_time_seconds{application=\"worker-server\"}",
           "refId": "A"
         }
       ],