Change default deployment for Msteam channel to CommercialDeployment (#28741)

Author: kunsinghms

specification/botservice/resource-manager/Microsoft.BotService/preview/2023-09-15-preview/botservice.json

@@ -2412,7 +2412,7 @@
         "deploymentEnvironment": {
           "type": "string",
           "description": "Deployment environment for Microsoft Teams channel calls",
-          "default": "FallbackDeploymentEnvironment"
+          "default": "CommercialDeployment"
         },
         "acceptedTerms": {
           "type": "boolean",