[Compute] add property to PSDisk (Azure#21001)

Co-authored-by: Theodore Chang <theodore.l.chang@gmail.com>

Author: grizzlytheodore

src/Compute/Compute/ChangeLog.md

@@ -22,6 +22,7 @@
 ## Upcoming Release
 * Added breaking change message for `New-AzVmss`.
 * Added `-PerformancePlus` parameter to `New-AzDiskConfig`
+* Added `CompletionPercent` property to PSDisk object.
 
 ## Version 5.4.0
 * Added `-SkipIdentity`, `-PathUserIdentity`, `-IsTest` parameter to `Set-AzVMAEMExtension` 

src/Compute/Compute/Generated/Models/PSDisk.cs

@@ -77,5 +77,6 @@ public string ResourceGroupName
         public string PublicNetworkAccess { get; set; }
         public SupportedCapabilities SupportedCapabilities { get; set; }
         public string DataAccessAuthMode { get; set; }
+        public double? CompletionPercent { get; set; }
     }
 }