Can not define multiple explicit clients with multiple services

[v-jiaodi]

RLC case:
https://github.com/Azure/autorest.typescript/blob/main/packages/typespec-ts/test/unit/clientUtil.spec.ts#L78
https://github.com/Azure/autorest.typescript/blob/main/packages/typespec-ts/test/unit/clientUtil.spec.ts#L112

typespec:

import "@azure-tools/typespec-client-generator-core";
using Azure.ClientGenerator.Core;
    
@service
namespace MyService {
  @client({
    name: "MyClient",
    service: MyService
  })
  interface MyInterface {
    op1(): void
  }
}

@service
namespace MySecondService {
  @client({
    name: "MySecondClient",
    service: MySecondService
  })
  interface MySecondInterface {
    op1(): void
  }
}

error log:

[v-jiaodi]

In order to make the nightly CI pass, temporarily skip these two cases.
https://dev.azure.com/azure-sdk/public/_build/results?buildId=5707767&view=logs&j=d0d2a462-287f-51d5-e186-98b6b49f577f&t=262df625-0311-50e6-2e41-9dfcf83669de

[JialinHuang803]

This is no longer supported which is by design from TCGC since version 0.63.1: https://github.com/Azure/typespec-azure/blob/14f8746cea3ceeaac39af89dd9fd5eb7e2993c28/packages/typespec-client-generator-core/src/internal-utils.ts#L840C1-L841C1