Use GH aliases (Azure#23639)

updated according to the [guidance](https://teams.microsoft.com/l/message/19:[email protected]/1647518325907?tenantId=72f988bf-86f1-41af-91ab-2d7cd011db47&groupId=3e17dcb0-4257-4a30-b843-77f47f1d4121&parentMessageId=1647518325907&teamName=Azure%20SDK&channelName=General&createdTime=1647518325907)

Author: petrsvihlik

.github/CODEOWNERS

@@ -51,8 +51,8 @@
 /sdk/communication/                                                  @acsdevx-msft
 /sdk/communication/azure-communication-phonenumbers/                 @miguhern @whisper6284 @lucasrsant @RoyHerrod @danielav7
 /sdk/communication/azure-communication-sms/                          @RoyHerrod @arifibrahim4
-/sdk/communication/azure-communication-identity/                     @Azure/acs-identity-sdk
-/sdk/communication/**/_shared/                                       @Azure/acs-identity-sdk
+/sdk/communication/azure-communication-identity/                     @Azure/acs-identity-sdk @petrsvihlik @AikoBB @maximrytych-ms @martinbarnas-ms
+/sdk/communication/**/_shared/                                       @Azure/acs-identity-sdk @petrsvihlik @AikoBB @maximrytych-ms @martinbarnas-ms
 
 # PRLabel: %KeyVault
 /sdk/keyvault/                                                       @schaabs @mccoyp @YalinLi0312