`az account get-access-token` should allow passing both `--subscription` and `--tenant`

[jiasli]

Related command
az account get-access-token

Is your feature request related to a problem? Please describe.
Azure/azure-sdk-for-go#25758

az account get-access-token --subscription ... --tenant ... always exits with an error "Please specify only one of subscription and tenant, not both".

Describe the solution you'd like
If --subscription and --tenant are provided together and they do point to the same tenant, az account get-access-token should allow passing both arguments.

Describe alternatives you've considered

Additional context

[yonzhan]

Thank you for opening this issue, we will look into it.