Shared Filesystems can't be deployed on local-only storage due to "HA" requirement

### problem

The Shared Filesystem appliance requires a "HA enabled" compute offering - and it's not a bad idea, but in cloud with local storage only this becomes a problem as it's pointless to add HA=true to an offering on local storage and could also lead to other possible issues in Cloudstack internally (who knows..).

Is it worth adding a global option, such as "sharedfs.ha.required" and set it to yes/no depending on what storage you are running?

### versions

4.20 KVM

### The steps to reproduce the bug

Deploy Filesystem Share without HA enabled compute offering.

### What to do about it?

Discuss and maybe implement an extra global option to require or not HA in offerings.

从 Shared Filesystem appliance 的部署路径以及要求启用 HA 的计算 offering 的验证开始。使用仅本地存储和不带 HA 的 offering 重现部署，然后追踪该要求是如何应用的。完成的标准是：可以针对本地存储配置该行为，同时在需要的地方保留当前的 HA 要求。

由索引模型根据 Issue 内容生成。