Add label mapping for 'preserve_nic_ips'.

src/utils/LabelDictionary.js

@@ -51,6 +51,7 @@ class LabelDictionary {
     keyvault_dns: 'Keyvault DNS Suffix',
     sql_server_hostname: 'SQL Server Hostname Suffix',
     storage_endpoint: 'Storage Endpoint Suffix',
+    preserve_nic_ips: 'Preserve NIC IPs',
   }
 
   // Fields which have enums for which dictionary labels should be used.