feat(CG-901): add application gateway support

Author: james-zhou-inspire11

src/enums/serviceMap.ts

@@ -88,7 +88,6 @@ import AzureBackupPolicy from '../services/backupPolicies'
 import AzureBilling from '../services/billing'
 import AzureLogProfiles from '../services/logProfiles'
 import Subscription from '../services/subscription'
-import AzureApplicationGateway from '../services/applicationGateway'
 
 /**
  * serviceMap is an object that contains all currently supported services for AWS