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.

從 Shared Filesystem appliance 的部署路徑以及要求啟用 HA 的計算 offering 的驗證開始。使用僅本機儲存和不含 HA 的 offering 重現部署，然後追蹤該要求如何套用。完成的標準是：可以針對本機儲存設定此行為，同時在需要的地方保留目前的 HA 要求。

由索引模型根據 Issue 內容生成。