Changed minimum links to number of members, added a confirmation page for the...

Changed minimum links to number of members, added a confirmation page for the minimum links value and made interface description optional.

gso/products/product_blocks/iptrunk.py

@@ -55,14 +55,14 @@ class IptrunkInterfaceBlockProvisioning(IptrunkInterfaceBlockInactive, lifecycle
     """An IP trunk interface that is being provisioned."""
 
     interface_name: str
-    interface_description: str
+    interface_description: str | None = None
 
 
 class IptrunkInterfaceBlock(IptrunkInterfaceBlockProvisioning, lifecycle=[SubscriptionLifecycle.ACTIVE]):
     """An active IP trunk interface."""
 
     interface_name: str
-    interface_description: str
+    interface_description: str | None = None
 
 
 class IptrunkSides(UniqueConstrainedList[T_co]):  # type: ignore[type-var]