add ActionOnExistingTargetTable property for Synapse Link Connection (#23591)

update changelog

Author: kevinzz6

src/Synapse/Synapse/ChangeLog.md

@@ -19,6 +19,8 @@
 -->
 
 ## Upcoming Release
+* Updated Azure.Analytics.Synapse.Artifacts to 1.0.0-preview.19
+* Added ActionOnExistingTargetTable property for Synapse Link Connection
 
 ## Version 3.0.4
 * Upgraded Azure.Core to 1.35.0.

src/Synapse/Synapse/Models/DataPlaneModels/Artifact/LinkConnection/PSLinkConnectionTargetDatabaseTypeProperties.cs

@@ -22,10 +22,13 @@ public PSLinkConnectionTargetDatabaseTypeProperties(LinkConnectionTargetDatabase
         {
             this.CrossTableTransaction = properties?.CrossTableTransaction;
             this.DropExistingTargetTableOnStart = properties?.DropExistingTargetTableOnStart;
+            this.ActionOnExistingTargetTable = properties?.ActionOnExistingTargetTable;
         }
 
         public bool? CrossTableTransaction { get; set; }
 
         public bool? DropExistingTargetTableOnStart { get; set; }
+
+        public ActionOnExistingTargetTable? ActionOnExistingTargetTable { get; set; }
     }
 }