Refactor(eos_designs): Enforce cross-region site name uniqueness at s…

…chema level

python-avd/pyavd/_eos_designs/schema/eos_designs.schema.yml

@@ -703,6 +703,7 @@ keys:
     primary_key: name
     unique_keys:
     - id
+    - sites.name
     items:
       type: dict
       $ref: eos_cli_config_gen#/keys/router_adaptive_virtual_topology/keys/region

python-avd/pyavd/_eos_designs/schema/schema_fragments/cv_pathfinder_regions.schema.yml

@@ -14,6 +14,7 @@ keys:
     primary_key: name
     unique_keys:
       - id
+      - sites.name
     items:
       type: dict
       $ref: "eos_cli_config_gen#/keys/router_adaptive_virtual_topology/keys/region"

python-avd/pyavd/_eos_designs/shared_utils/wan.py

@@ -269,8 +269,6 @@ def wan_region(self: SharedUtils) -> dict | None:
         """
         WAN region for CV Pathfinder
 
-        Also checking if site names are unique across all regions.
-
         The region is required for edges, but optional for pathfinders
         """
         node_defined_region = get(
@@ -286,17 +284,6 @@ def wan_region(self: SharedUtils) -> dict | None:
             self.hostvars, "cv_pathfinder_regions", required=True, org_key="'cv_pathfinder_regions' key must be set when 'wan_mode' is 'cv-pathfinder'."
         )
 
-        # Verify that site names are unique across all regions.
-        site_names = [site["name"] for region in regions for site in region["sites"]]
-        if len(site_names) != len(set(site_names)):
-            # We have some site names that are not unique
-            # Now find them (slow so no need to do if we don't have duplicates)
-            duplicate_site_names = [site_name for site_name in site_names if site_names.count(site_name) > 1]
-            raise AristaAvdError(
-                "WAN Site names must be unique across all regions. "
-                f"Found the following duplicate site name(s) under 'cv_pathfinder_regions.[].sites. {duplicate_site_names}"
-            )
-
         return get_item(
             regions,
             "name",