Cleanup removed image aliases from autocompleters (#23599)

* Update NewAzureVMCommand.cs

* Update VirtualMachineScaleSetCreateOrUpdateMethod.cs

* Update ChangeLog.md

Author: Sandido

src/Compute/Compute/ChangeLog.md

@@ -29,6 +29,7 @@
 * Fixed the `New-AzVM` bug to avoid accessing the `EncryptionAtHost` property for subscriptions who cannot access it since it is behind a feature flag.
 * Updated `Get-AzVmExtension` to return instanceView when used with `-Status`.
 * Reverted SSH Private Key File permission changes in `New-AzVm`.
+* Removed references to image aliases in `New-AzVM` and `New-AzVmss` to images that were removed.
 
 ## Version 7.0.0
 * Added update functionality in `Update-AzVmss` for parameters `SecurityType`, `EnableSecureBoot`, and `EnableVtpm` for the parameter set with the Put operation.

src/Compute/Compute/Manual/VirtualMachineScaleSetCreateOrUpdateMethod.cs

@@ -55,8 +55,7 @@ public partial class NewAzureRmVmss : ComputeAutomationBaseCmdlet
             "Win2019Datacenter", 
             "Win2016Datacenter", 
             "Win2012R2Datacenter", 
-            "Win2012Datacenter", 
-            "Win2008R2SP1")]
+            "Win2012Datacenter")]
         [Alias("Image")]
         public string ImageName { get; set; } = "Win2016Datacenter";
 

src/Compute/Compute/VirtualMachine/Operation/NewAzureVMCommand.cs

@@ -210,15 +210,11 @@ public class NewAzureVMCommand : VirtualMachineBaseCmdlet
 
         [Parameter(ParameterSetName = SimpleParameterSet, Mandatory = false)]
         [PSArgumentCompleter(
-            "CentOS",
             "CentOS85Gen2",
-            "Debian",
             "Debian11",
             "OpenSuseLeap154Gen2",
-            "RHEL",
             "RHELRaw8LVMGen2",
             "SuseSles15SP3",
-            "UbuntuLTS",
             "Ubuntu2204",
             "FlatcarLinuxFreeGen2",
             "Win2022Datacenter",