Added CRR support for southeastus, westus3 region (#26587)

Author: hiaga

src/RecoveryServices/RecoveryServices.Backup/Helpers/BackupUtils.cs

@@ -94,7 +94,8 @@ public class BackupUtils
             {"taiwannorth", "taiwannorthwest"},
             {"taiwannorthwest", "taiwannorth"},
             {"jioindiacentral", "jioindiawest"},
-            {"jioindiawest", "jioindiacentral"}
+            {"jioindiawest", "jioindiacentral"},
+            {"southeastus", "westus3"}
         };
 
         /// <summary>

src/RecoveryServices/RecoveryServices/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Added CRR support for southeastus, westus3 region.
 * Added support for enabling Disk access settings for managed VM restores.
 
 ## Version 7.2.0