support container name (#21720)

Author: yifanz7

src/Storage/Storage.Management/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Added "$blobchangefeed" to be a valid container name
 
 ## Version 5.6.0
 * Supported rename file and directory

src/Storage/Storage/Common/NameUtil.cs

@@ -73,7 +73,7 @@ public static void ValidateContainerName(string name)
         /// <returns>True for valid container name, otherwise return false</returns>
         public static bool IsValidContainerName(string containerName)
         {
-            Regex regex = new Regex(@"^\$root$|^\$logs$|^\$web$|^[a-z0-9]([a-z0-9]|(?<=[a-z0-9])-(?=[a-z0-9])){2,62}$");
+            Regex regex = new Regex(@"^\$root$|^\$logs$|^\$web$|^\$blobchangefeed$|^[a-z0-9]([a-z0-9]|(?<=[a-z0-9])-(?=[a-z0-9])){2,62}$");
             return regex.IsMatch(containerName);
         }
 
@@ -89,8 +89,9 @@ public static bool IsValidContainerPrefix(string containerPrefix)
                 string root = "$root";
                 string logs = "$logs";
                 string web = "$web";
+                string blobchangefeed = "$blobchangefeed";
 
-                if (root.IndexOf(containerPrefix) == 0 || logs.IndexOf(containerPrefix) == 0 || web.IndexOf(containerPrefix) == 0)
+                if (root.IndexOf(containerPrefix) == 0 || logs.IndexOf(containerPrefix) == 0 || web.IndexOf(containerPrefix) == 0 || blobchangefeed.IndexOf(containerPrefix) == 0)
                 {
                     return true;
                 }