Disable local user access for staging storage account

Signed-off-by: Jan Egil Ring <[email protected]>

azure_jumpstart_arcbox/bicep/mgmt/mgmtStagingStorage.bicep

@@ -25,7 +25,7 @@ resource storageAccount 'Microsoft.Storage/storageAccounts@2022-05-01' = {
   kind: 'StorageV2'
   properties: {
     supportsHttpsTrafficOnly: true
-    isLocalUserEnabled: true
+    isLocalUserEnabled: false
     allowSharedKeyAccess: false
   }
 }