Add spector case for Azure Alternate Type

[v-jiaodi]

typespec from https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs/azure/client-generator-core/alternate-type

1. run rush update && rush build
2. run rushx copy:typespec under folder packages/typespec.
3. Add item into azureRlcTsps and azureModularTsps in file cadl-ranch-list.js.
   item:

  {
    outputPath: "azure/client-generator-core/alternate-type",
    inputPath: "azure/client-generator-core/alternate-type"
  }

4. create tspconfig.yaml to azureIntegration/generated/azure/client-generator-core/alternate-type and azureModularIntegration/generated/azure/client-generator-core/alternate-type, the file configuration should refer to the cases in the same directory respectively.
5. create azureAlternateType.spec.ts for azureIntegration and azureModularIntegration, then complete the case file according to the temp/specs/azure/client-generator-core/alternate-type/mockapi.ts
6. Verify that all Integration case tests pass. If there are any issues, please fix them.