Add firewall Public IP Prefix as output

[SazniMohamed]

Description

Added an output in the Firewall-Multiple-PIP module to expose the Public IP Prefix of the IP addresses attached to the firewall. This allows other modules or the root configuration to reference the firewall’s public IP prefix for further resource dependencies.

Output added:

output "firewall_public_ip_prefix" {
  depends_on = [azurerm_public_ip_prefix.public_ip_prefix_fw]
  value      = azurerm_public_ip_prefix.public_ip_prefix_fw.ip_prefix
}

Impact:

Makes the firewall’s Public IP Prefix available externally.

Ensures dependent resources can reference it safely.