Update the breaking change warning to show which aliases will be removed (#21446)

* msg and changelog

* vmss

* Update ChangeLog.md

---------

Co-authored-by: Yunchi Wang <[email protected]>

Author: Sandido

src/Compute/Compute/ChangeLog.md

@@ -20,6 +20,7 @@
 
 -->
 ## Upcoming Release
+* Updated the breaking change warning in `New-AzVM` and `New-AzVmss` regarding using the new versioned image aliases to indicate that certain aliases will be removed next breaking change release.
 
 ## Version 5.7.0
 * Addressed bug in `Remove-AzVmss` to throw error when `-InstanceId` is null. [#21162]

src/Compute/Compute/Manual/VirtualMachineScaleSetCreateOrUpdateMethod.cs

@@ -33,7 +33,7 @@
 
 namespace Microsoft.Azure.Commands.Compute.Automation
 {
-    [GenericBreakingChange("Consider using the image alias including the version of the distribution you want to use in the \"-ImageName\" parameter of the \"New-AzVmss\" cmdlet. On April 30, 2023, the image deployed using `UbuntuLTS` will reach its end of life.")]
+    [GenericBreakingChange("Consider using the image alias including the version of the distribution you want to use in the \"-ImageName\" parameter of the \"New-AzVmss\" cmdlet. On April 30, 2023, the image deployed using `UbuntuLTS` will reach its end of life. In October 2023, the aliases `UbuntuLTS`, `CentOS`, `Debian`, and `RHEL` will be removed.")]
     public partial class NewAzureRmVmss : ComputeAutomationBaseCmdlet
     {
         private const string flexibleOrchestrationMode = "Flexible", uniformOrchestrationMode = "Uniform";

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

@@ -54,7 +54,7 @@
 
 namespace Microsoft.Azure.Commands.Compute
 {
-    [GenericBreakingChange("Consider using the image alias including the version of the distribution you want to use in the \"-Image\" parameter of the \"New-AzVM\" cmdlet. On April 30, 2023, the image deployed using `UbuntuLTS` will reach its end of life.")]
+    [GenericBreakingChange("Consider using the image alias including the version of the distribution you want to use in the \"-Image\" parameter of the \"New-AzVM\" cmdlet. On April 30, 2023, the image deployed using `UbuntuLTS` will reach its end of life. In October 2023, the aliases `UbuntuLTS`, `CentOS`, `Debian`, and `RHEL` will be removed.")]
     [GenericBreakingChange("Starting in May 2023 the \"New-AzVM\" cmdlet will deploy with the Trusted Launch configuration by default. To know more about Trusted Launch, please visit https://docs.microsoft.com/en-us/azure/virtual-machines/trusted-launch")]
     [GenericBreakingChange("It is recommended to use parameter \"-PublicIpSku Standard\" in order to create a new VM with a Standard public IP.Specifying zone(s) using the \"-Zone\" parameter will also result in a Standard public IP.If \"-Zone\" and \"-PublicIpSku\" are not specified, the VM will be created with a Basic public IP instead.Please note that the Standard SKU IPs will become the default behavior for VM creation in the future")]
     [Cmdlet("New", ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "VM", SupportsShouldProcess = true, DefaultParameterSetName = "SimpleParameterSet")]