Adding PowerOff option to allow graceful shutdown.

[arg5739]

Currently VM just stops instead graceful shutdown.
in this PR we are trying to add flag that allow customer to choose if they want graceful shutdown or not.

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[jocardeMSFT]

Please include testing complete that validated these changes and include screenshots where possible. Also, please link the related ADO work item in the description.

[jocardeMSFT]

We should align the naming. If we are going to call it Stop_Graceful in the protobuf, we should call it StopGraceful in the interface.

I realize this is inconsistent with the naming in the upstream arm api but we can do something like

PowerOff arm api -> StopGraceful MOC api
PowerOff SkipShutdown arm api -> Stop MOC api

but naming should be consistent in the moc bubble.

[jocardeMSFT]

I actually don't even think we need to expand the interface, just add a flag to Stop to indicate for skipshutdown.

we are doing a bit of a slow rollout api replacement in the arm api where poweroff will replace stop but it is not necessary in the MOC api's where we can just outright modify the behavior of the stop api because we control the call pattern.

i.e. all arm STOP calls STOP with skip shutdown to true.
all arm poweroff calls STOP and can toggle skipshutdown based on their paramaterization.