[CosmosDB] Add breaking change notification for list connection string output change (Azure#24108)

* add breaking change notification for list connection string changes

* use GenericBreakingChangeWithVersionAttribute

Author: carjackson-msft

src/CosmosDB/CosmosDB/ChangeLog.md

@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Added breaking change message for ListConnectionStrings changes
 
 ## Version 1.14.0
 * Introduced Restore-AzCosmosDBSqlDatabase, Restore-AzCosmosDBSqlContainer to restore deleted database and containers in the same account for SQL.

src/CosmosDB/CosmosDB/CosmosDBAccount/GetAzCosmosDBAccountKey.cs

@@ -20,9 +20,11 @@
 using Microsoft.Azure.Commands.ResourceManager.Common.ArgumentCompleters;
 using Microsoft.Azure.Management.CosmosDB.Models;
 using Microsoft.Azure.Management.Internal.Resources.Utilities.Models;
+using Microsoft.WindowsAzure.Commands.Common.CustomAttributes;
 
 namespace Microsoft.Azure.Commands.CosmosDB
 {
+    [GenericBreakingChangeWithVersionAttribute("Output type for -Type ConnectionStrings will be changed to List<DatabaseAccountConnectionString> in next major version.", Constants.DeprecateByAzVersion12, Constants.DeprecateByVersion2)]
     [Cmdlet(VerbsCommon.Get, ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "CosmosDBAccountKey", DefaultParameterSetName = NameParameterSet), OutputType(typeof(Hashtable))]
     public class GetAzCosmosDBAccountKey : AzureCosmosDBCmdletBase
     {

src/CosmosDB/CosmosDB/Helpers/Constants.cs

@@ -16,6 +16,10 @@ namespace Microsoft.Azure.Commands.CosmosDB.Helpers
 {
     internal static class Constants
     {
+
+        public const string DeprecateByAzVersion12 = "12.0.0";
+        public const string DeprecateByVersion2 = "2.0.0";
+
         public const string ResourceGroupNameHelpMessage = "Name of resource group.";
         public const string ResourceIdHelpMessage = "ResourceId of the resource.";