Public Preview: Perimeter link feature in network security perimeter

Perimeter link (cross-perimeter connectivity) is a network security perimeter capability that allows trusted resources in two different network security perimeters to securely communicate with each other using Managed Identity (MSI), without requiring additional network security perimeter access rules or network configuration changes. It preserves Zero Trust boundaries while enabling controlled service-to-service access across perimeters [Learn more](https://learn.microsoft.com/en-us/azure/private-link/perimeter-links-overview).