PreemptionVulnerability type 
Defines values for PreemptionVulnerability. 
KnownPreemptionVulnerability can be used interchangeably with PreemptionVulnerability,
this enum contains the known values that the service supports.
Known values supported by the service
NotPreemptable: Cannot be preempted 
Preemptable: May be preempted
type PreemptionVulnerability = string