appconfig mi test (#35842)

* update yml

* update

Author: xiangyan99

sdk/appconfiguration/tests.yml

@@ -14,9 +14,13 @@ extends:
       Packages: ${{ parameters.Services }}
       SupportedClouds: 'Public,UsGov,China'
       TestTimeoutInMinutes: 240
+      UseFederatedAuth: true
       CloudConfig:
         Public:
           SubscriptionConfiguration: $(sub-config-azure-cloud-test-resources)
+          ServiceConnection: azure-sdk-tests
+          SubscriptionConfigurationFilePath: eng/common/TestResources/sub-config/AzurePublicMsft.json
+
         UsGov:
           SubscriptionConfiguration: $(sub-config-gov-test-resources)
         China: