Add health test to check for multiple switches that have VFP extension enabled

[arudell]

Description

Summary of changes:
This pull request primarily introduces new functionality related to Virtual Filtering Platform (VFP) enabled virtual switches in the SDN diagnostics module. The most significant changes include the addition of a new cmdlet, updates to existing cmdlets, and enhancements to the diagnostics configuration.

New Functionality:

• Added Get-SdnVMSwitch cmdlet to retrieve virtual switches from the hypervisor with an option to filter by VFP enabled switches.
• Introduced Test-SdnVfpEnabledVMSwitch cmdlet to check that only one VFP enabled virtual switch is configured on the system.

Enhancements to Existing Cmdlets:

• Updated Get-SdnNetAdapterEncapOverheadConfig to support filtering by switch name or ID and to use the new Get-SdnVMSwitch cmdlet for retrieving VFP enabled switches. [1] [2]

Configuration and Diagnostics Updates:

• Added new entries for Get-SdnVMSwitch and Test-SdnVfpEnabledVMSwitch in the src/SdnDiagnostics.psd1 file. [1] [2]
• Included Test-SdnVfpEnabledVMSwitch in the diagnostics configuration file with description and impact details.
• Integrated Test-SdnVfpEnabledVMSwitch into the Debug-SdnServer function to be part of the diagnostic tests.

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.