CodeGen from PR 18149 in Azure/azure-rest-api-specs

[BotService] Add OutlookChannel to channelNames (#18149)

* Add OutlookChannel to channelNames

* revert the change in stable version

Author: SDKAuto

schemas/2021-05-01-preview/Microsoft.BotService.json

@@ -173,7 +173,8 @@
                 "DirectLineChannel",
                 "SmsChannel",
                 "LineChannel",
-                "DirectLineSpeechChannel"
+                "DirectLineSpeechChannel",
+                "OutlookChannel"
               ]
             },
             {
@@ -671,7 +672,8 @@
                 "DirectLineChannel",
                 "SmsChannel",
                 "LineChannel",
-                "DirectLineSpeechChannel"
+                "DirectLineSpeechChannel",
+                "OutlookChannel"
               ]
             },
             {