RDP does not support platforms other than Windows

### Describe the bug

Trying to run any RDP connection on Darwin or Linux results in the `RDP connection is not supported for this platform. Supported platforms: Windows` error, even when the official Microsoft RDP client is installed.

### Related command

`az ssh arc --resource-group "Azure-Arc" --name $machine --local-user $username --yes --rdp -- -o StrictHostKeyChecking=accept-new`

### Errors

`RDP connection is not supported for this platform. Supported platforms: Windows`

### Issue script & Debug output

N/A

### Expected behavior

On macOS and many Linux repos, the RDP client can be opened via the RDP URI format. This seems to be an arbitrary restriction to the RDP feature. The CLI should at least *attempt* to start an RDP connection, or offer an RDP URL, especially considering not everyone wants to use the default RDP client

### Environment Summary

azure-cli 2.64.0 *

core 2.64.0 *
telemetry 1.1.0

Extensions:
connectedmachine 1.0.0b2
ssh 2.0.5

Dependencies:
msal 1.30.0
azure-mgmt-resource 23.1.1

Python location '/opt/homebrew/Cellar/azure-cli/2.64.0/libexec/bin/python'
Extensions directory '/Users/ed/.azure/cliextensions'

Python (Darwin) 3.11.9 (main, Apr 2 2024, 08:25:04) [Clang 15.0.0 (clang-1500.3.9.4)]

Legal docs and information: aka.ms/AzureCliLegal

### Additional context

_No response_