Add local authority links and update seed

config/local_authorities_data/local_authority_links_2025.csv

@@ -0,0 +1,5 @@
+local_authority_code,linked_local_authority_code
+E08000038,E08000016
+E08000039,E08000019
+E08000016,E08000038
+E08000019,E08000039

db/seeds.rb

@@ -13,10 +13,12 @@ def find_or_create_user(organisation, email, name, role)
 end
 
 if LocalAuthority.count.zero?
-  la_path = "config/local_authorities_data/initial_local_authorities.csv"
+  paths = ["config/local_authorities_data/initial_local_authorities.csv", "config/local_authorities_data/2025_local_authorities.csv"]
-  service = Imports::LocalAuthoritiesService.new(path: la_path)
+  paths.each do |path|
+    service = Imports::LocalAuthoritiesService.new(path:)
     service.call
   end
+end
 
 unless Rails.env.test?
   if LaRentRange.count.zero?