support track2 js codegen (#15149)
support track2 js codegen (#15149)

* support js track2 sdk in swagger

* support track2 js sdk for all rps

* Revert "support track2 js sdk for all rps"

This reverts commit 6864adf0715ccefeda4a82f74ff098cc7bc77728.
solankisamir/azure-rest-api-specs,brjohnstmsft/azure-rest-api-specs,AppPlatPerf/azure-rest-api-specs,johanste/azure-rest-api-specs,AsrOneSdk/azure-rest-api-specs,naveedaz/azure-rest-api-specs,AsrOneSdk/azure-rest-api-specs,naveedaz/azure-rest-api-specs,AppPlatPerf/azure-rest-api-specs,johanste/azure-rest-api-specs,solankisamir/azure-rest-api-specs,brjohnstmsft/azure-rest-api-specs