UI: Show Account and Project List in the Import Instance Form

### The required feature described as a wish

As a Admin/Operator I would like to select the list of Account and project from the dropdown during the vm import from vmware to kvm

Currently Admin user has to manually type the Account Name and Project Name, this can lead to errors

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We support the listing of account and project during network creation , similarly it should be supported import vm form

首先定位 VM 导入表单，并将其账户和项目输入项与现有的网络创建表单进行比较，后者已经列出了这些值。根据附带的屏幕截图确认所需的下拉菜单行为，并验证管理员在 VMware-to-KVM 导入期间无需手动输入即可同时选择账户和项目。

由索引模型根据 Issue 内容生成。