Use `if_exists: true` when removing duplicate indexes (#35309)

db/migrate/20241014010506_remove_duplicate_indexes.rb

@@ -2,9 +2,11 @@
 
 class RemoveDuplicateIndexes < ActiveRecord::Migration[7.1]
   def change
+    with_options if_exists: true do
       remove_index :account_aliases, :account_id
       remove_index :account_relationship_severance_events, :account_id
       remove_index :custom_filter_statuses, :status_id
       remove_index :webauthn_credentials, :user_id
     end
   end
+end