Description of problem:  Upon review of the UI flows around disk hotplug and in light of additional development of backend functionality I would like to request the following enhancements to the user interface which should make the UI easier to understand and the feature easier to consume:

1. In the "Add Disk" dialog, remove the `detach disk upon VM restart' checkbox completely and have the default be that a VM restart will re-hotplug the disk.  If the user would like the disk to be detached from the VM, she should perform an explicit action to do so.

2. In the VM disks kebab menu, rename 'Delete' to 'Detach' since this more accurately describes what is happening.

3. In the "Detach disk" confirmation dialog, the option to delete the disk should be unchecked by default.  This will result in the less destructive option being the default path and this more accurately represents what a 'detach' operation should be by default.

Additional info:  Please see attached screenshots for more context.