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