Check ps remoteaccess class present

[arudell]

Description

This pull request introduces a new health check for SDN Gateway nodes to ensure the RemoteAccess CIM class is available, which helps verify that the necessary WMI providers for gateway functionality are installed and operational. The new test is integrated into the gateway diagnostics workflow and its metadata is added to the configuration.

New Gateway Health Check:

• Added Test-SdnGatewayRemoteAccessCimClass function to validate that the PS_RemoteAccess CIM class is accessible in the root/microsoft/windows/remoteaccess namespace, ensuring the RemoteAccess role is installed and functional on Gateway nodes.
• Integrated the new health check into the Debug-SdnGateway diagnostic workflow, so it runs automatically with other gateway tests.
• Registered the new test and its metadata (friendly name, description, impact) in the SdnDiag.Health.Config.psd1 configuration file for reporting and documentation purposes.

Change type

• Bug fix (non-breaking change)
• Code style update (formatting, local variables)
• New Feature (non-breaking change that adds new functionality without impacting existing)
• Breaking change (fix or feature that may cause functionality impact)
• Other

Checklist:

• My code follows the style and contribution guidelines of this project.
• I have tested and validated my code changes.