message: support track2 js codegen
  * support js track2 sdk in swagger
  * support track2 js sdk for all rps
  * Revert "support track2 js sdk for all rps"
  This reverts commit
diff: "mainRepository": "Azure/azure-sdk-for-js",
  "mainBranch": "feature/v4"
  },
  + "azure-sdk-for-js-track2": {
  + "integrationRepository": "AzureSDKAutomation/azure-sdk-for-js",
  + "mainRepository": "Azure/azure-sdk-for-js"
  + },
  "azure-sdk-for-net": {
  "integrationRepository": "AzureSDKAutomation/azure-sdk-for-net",
  "mainRepository": "Azure/azure-sdk-for-net"
  