Onboard DigitalTwins to Private Link Common Cmdlets (#14613)

* Onboard DigitalTwins to Private Link Common Cmdlets

* Removed the change log

* Added DigitalTwins in lexicographical order

Author: anakarparida

src/Network/Network/PrivateLinkService/PrivateLinkServiceProvider/ProviderConfiguration.cs

@@ -26,6 +26,7 @@ static ProviderConfiguration()
             RegisterConfiguration("Microsoft.DBforPostgreSQL/servers", "2018-06-01");
             RegisterConfiguration("Microsoft.Devices/IotHubs", "2020-03-01");
             RegisterConfiguration("Microsoft.DocumentDB/databaseAccounts", "2019-08-01-preview");
+            RegisterConfiguration("Microsoft.DigitalTwins/digitalTwinsInstances", "2020-12-01");
             RegisterConfiguration("Microsoft.EventGrid/topics", "2020-04-01-preview");
             RegisterConfiguration("Microsoft.EventGrid/domains", "2020-04-01-preview"); 
             RegisterConfiguration("Microsoft.EventHub/namespaces", "2018-01-01-preview");