Add new TSG for network infra connection validator failure due to exception

[fangfei]

Add new TSG for network infra connection validator failure due to exception.

During execution of validator "Test-NwkInfraConnectionValidator_InfraIpPoolConnection", if the validator failed with "AzureLocal_NetworkInfraConnection_Test_Infra_IP_Connection_ExceptionFound", it might means that something wrong with the system itself. So will need to ask the end user to fix the problems and retry validator.

[Copilot]

Pull request overview

This pull request adds a new troubleshooting guide (TSG) for handling exceptions that occur during network infrastructure connection validation in Azure Local deployments. The document provides guidance for diagnosing and resolving unexpected errors in the Test-NwkInfraConnectionValidator_InfraIpPoolConnection validator.

Changes:

• Added new TSG document for exception handling during infrastructure IP pool connection validation
• Updated the Networking README.md table of contents to include the new troubleshooting guide

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
TSG/EnvironmentValidator/Networking/Troubleshoot-Network-Test-Infra-IP-Connection-ExceptionFound.md	New TSG document providing comprehensive troubleshooting steps for the AzureLocal_NetworkInfraConnection_Test_Infra_IP_Connection_ExceptionFound validator, including exception analysis, system prerequisites checks, and Hyper-V reinstallation guidance
TSG/EnvironmentValidator/Networking/README.md	Updated table of contents to add a link to the new Infrastructure IP Connection Exception Found troubleshooting guide

[Copilot]

The PowerShell commands to disable and enable Hyper-V will cause system reboots and could disrupt workloads. According to the PowerShell code guidelines, commands that change environment state should include clear warnings about disruptions. Consider adding a warning callout before this code block to alert users that these commands will require reboots and may impact running workloads or VMs.

[Copilot]

Grammatical issue: "If the exception is complaining something like below" should be "If the exception message looks like the following" or "If the exception complains about something like below".

Suggested change

	If the exception is complaining something like below:
	If the exception message looks like the following:

[Copilot]

Grammatical issue: "when ArcGateway enabled" should be "when ArcGateway is enabled".

Suggested change

	The infrastructure IP connectivity validator (including all endpoint tests) is **skipped** when **ArcGateway enabled**. ArcGateway provides alternative connectivity.
	The infrastructure IP connectivity validator (including all endpoint tests) is **skipped** when **ArcGateway is enabled**. ArcGateway provides alternative connectivity.

[Copilot]

The Severity field should include an explanation after "Critical". Based on the template and other TSG documents in this directory (e.g., Troubleshoot-Network-Test-InfraIP-Hyper-V-Readiness.md, Troubleshoot-Network-Test-InfraIP-vNIC-Readiness.md), the format should be: "Critical: This validator will block operations until remediated."