Bug: 模板变量的地域参数(Region)不生效，无法查看非ap-guangzhou地域的监控数据

[mikasun7]

【腾讯云可观测平台 模板变量-云产品监控-文档中心-腾讯云】 https://cloud.tencent.com/document/product/248/54510?from=copy

不管怎么切换地域，查询出来的都是 ap-guangzhou 地域的实例信息，如下图所示：

{
  "request": {
    "url": "api/datasources/proxy/5/cdb-internal",
    "data": { "Offset": 0, "Limit": 20 },
    "method": "POST",
    "hideFromInspector": false
  },
  "response": {
    "Response": {
      "Items": [
        // ...
      ],
      "RequestId": "14de7178-4d6a-41a6-bdcd-4984ec055f2c",
      "TotalCount": 209
    }
  }
}

For Bug tracing (please complete the following information):

• Grafana version: [8.5.21]
• Plugin version: [2.9.0 and 2.9.1]

[miaoxiong]

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