Add breaking change warning message for Start-AzStorageAccountMigration cmdlet (Azure#27396)

Co-authored-by: Yabo Hu <[email protected]>

Author: EmmaZhu

src/Storage/Storage.Autorest/custom/Start-AzStorageAccountMigration.ps1

@@ -64,6 +64,7 @@ INPUTOBJECT <IStorageIdentity>: Identity Parameter
 https://learn.microsoft.com/powershell/module/az.storage/start-azstorageaccountmigration
 #>
 function Start-AzStorageAccountMigration {
+[Microsoft.Azure.PowerShell.Cmdlets.Storage.Runtime.GenericBreakingChangeAttribute("A prompt that needs users' confirmation will be added when converting the account's redundancy configuration. Suppress it with -Force.", "14.0.0", "9.0.0", "2025/05/19")]
 [OutputType([System.Boolean])]
 [CmdletBinding(DefaultParameterSetName='CustomerExpanded', PositionalBinding=$false, SupportsShouldProcess, ConfirmImpact='Medium')]
 param(

src/Storage/Storage.Management/ChangeLog.md

@@ -18,8 +18,10 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
-* Add warning message for upcoming breaking change on upload Azure file
+* Added warning message for upcoming breaking change on upload Azure file
     - `Set-AzStorageFileContent`
+* Added warning messages for an upcoming breaking change when converting the account's redundancy configuration
+    - `Start-AzStorageAccountMigration`
 
 ## Version 8.2.0
 * Supported new SkuName when create/update Storage account for Files Provisioned v2 account type:  "StandardV2_LRS", "StandardV2_GRS", "StandardV2_ZRS", "StandardV2_GZRS", "PremiumV2_LRS", "PremiumV2_ZRS"