enhancement: view agents from management server connected agents count

@DaanHoogland the problem is, API/UI will return say 4 agentscount but of these 4, 2 will be hypervisor host agents and 2 system VM agents. If I add a link for either the hosts view or the system VMs view, it can be confusing. Currently, we don't have a combined view for agents' list

_Originally posted by @shwstppr in https://github.com/apache/cloudstack/issues/12149#issuecomment-3588350206_

The original request for viewing connected hosts/agents from MS agents count was from @daviftorres in #12125

首先，通过 API/UI 跟踪管理服务器的已连接代理数量，并比较 hypervisor 主机和系统 VM 的视图。明确组合代理列表应如何表示 hypervisor 主机代理和系统 VM 代理，然后将完成定义为一种能够明确查看所有已连接代理的方式。

由索引模型根据 Issue 内容生成。