feat(): add cluster detail in alert meassage and label (#174)

## What type of PR is this?

* [x] Feature
* [ ] BUG
* [ ] Alerts
* [ ] Improvement
* [ ] Documentation
* [ ] Test and CI

## Which issue(s) this PR related:

issue # matrixorigin/MO-Cloud#1896

## What this PR does / why we need it:

1. 修改 alertmanager webhook adatper 的模版信息，传入集群 provider、type
2. 为 prometheus 告警添加额外的 label（集群信息）

Author: EZ4BRUCE

charts/mo-ob-opensource/values.yaml

@@ -261,6 +261,9 @@ kube-prometheus-stack:
 
   prometheus:
     prometheusSpec:
+      externalLabels:
+        # cluster provider
+        clusterDetail: aliyun-new-dev-controlplane
       logLevel: debug
       ruleSelectorNilUsesHelmValues: false
       serviceMonitorSelectorNilUsesHelmValues: false