[Sftp] Remove 'preview' tag to fix version (#28596)

Author: VeryEarly

src/Sftp/Sftp/Az.Sftp.psd1

@@ -115,7 +115,7 @@ PrivateData = @{
 * Integration with Azure PowerShell authentication context'
 
         # Prerelease string of this module
-        Prerelease = 'preview'
+        # Prerelease = 'preview'
 
         # Flag to indicate whether the module requires explicit user acceptance for install/update/save
         # RequireLicenseAcceptance = $false

tools/CreateMappings_rules.json

@@ -987,5 +987,9 @@
   {
     "alias": "StorageDiscovery",
     "module": "StorageDiscovery"
+  },
+  {
+    "alias": "Sftp",
+    "module": "Sftp"
   }
 ]