new IP trunk migration

Add IP trunk migration, including a refactor of the IP trunk model

gso/products/product_blocks/site.py

@@ -23,10 +23,10 @@ class SiteTier(strEnum):
 class SnmpCoordinate(ConstrainedStr):
     """An {term}`SNMP` coordinate, modeled as a constrained string.
 
-    The coordinate must match the format of `1.35`, `-12.3456`, etc.
+    The coordinate must match the format of `1.35`, `-123.456`, etc.
     """
 
-    regex = re.compile(r"^-?\d{1,2}\.\d+$")
+    regex = re.compile(r"^-?\d{1,3}\.\d+$")
 
 
 class SiteBlockInactive(ProductBlockModel, lifecycle=[SubscriptionLifecycle.INITIAL], product_block_name="SiteBlock"):