CodeGen from PR 14749 in Azure/azure-rest-api-specs

add apitestErrorCode doc (#14749)

* add apitestErrorCode doc

* add armRPC doc

* add roundTripInconsistentProperty doc

* small fix

* update

* update signalR armTemplate

* update yaml

* new file

* add testScenario with armTemplate

* update doc

* update readme.md

* update doc

* update NOTE section

* add signalRCreateOrUpdate example file

* udpate doc

* add generate test scenario section

* update doc

* add serviceFacbric test scenario file

* update managedClusters.yaml

* update generateABasicTestScenario.md

* update features doc

* add run api test gif

schemas/2021-04-01-preview/Microsoft.SignalRService.json

@@ -674,8 +674,7 @@
         "clientCertEnabled": {
           "oneOf": [
             {
-              "type": "boolean",
-              "default": true
+              "type": "boolean"
             },
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"