feat: don't create logs in validator if any logs already exist

app/services/bulk_upload/lettings/validator.rb

@@ -176,6 +176,7 @@ class BulkUpload::Lettings::Validator
   def create_logs?
     return false if any_setup_sections_incomplete?
     return false if over_column_error_threshold?
+    return false if any_logs_already_exist?
 
     row_parsers.all? { |row_parser| row_parser.log.valid? }
   end
@@ -203,6 +204,10 @@ private
     end
   end
 
+  def any_logs_already_exist?
+    row_parsers.any? { |row_parser| row_parser.log_already_exists? }
+  end
+
   def csv_parser
     @csv_parser ||= BulkUpload::Lettings::CsvParser.new(path:)
   end