Allow upload ssl certificates for a specifc zone

### The required feature described as a wish

As a User/Admin/Operator I would like to ,upload custom SSL for specific zone

Currently the certificate applies to all the zones once uploaded

The API also doesn't have the zone id parameter

https://cloudstack.apache.org/api/apidocs-4.21/apis/uploadCustomCertificate.html

There is a pr which moves the console proxy configuration from global level to zone level

https://github.com/apache/cloudstack/pull/11415

It would be beneficial for the operator to have certificates at zone level

首先阅读 uploadCustomCertificate API 文档和相关的 PR #11415，该 PR 将 console proxy 配置从全局级别移至 zone 级别。跟踪当前证书上传与 zone 配置之间的关联方式。当操作员可以为一个 zone 上传自定义证书，而不更改其他 zone 的证书，并且 API 中表示了 zone ID 时，即表示完成。

由索引模型根据 Issue 内容生成。