Fix performance of follow import (#13836)

app/services/import_service.rb

@@ -81,7 +81,9 @@ class ImportService < BaseService
       end
     end
 
-    Import::RelationshipWorker.push_bulk(items) do |acct, extra|
+    head_items = items.uniq { |acct, _| acct.split('@')[1] }
+    tail_items = items - head_items
+    Import::RelationshipWorker.push_bulk(head_items + tail_items) do |acct, extra|
       [@account.id, acct, action, extra]
     end
   end

app/services/resolve_account_service.rb

@@ -112,6 +112,8 @@ class ResolveAccountService < BaseService
   end
 
   def webfinger_update_due?
+    return false if @options[:check_delivery_availability] && !DeliveryFailureTracker.available?(@domain)
+
     @account.nil? || ((!@options[:skip_webfinger] || @account.ostatus?) && @account.possibly_stale?)
   end