You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mark_package_for_destruction_service.rb
    path of file: ./repos/gitlabhq/app/services/packages
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Packages
  class MarkPackageForDestructionService < BaseContainerService
    alias_method :package, :container

    def execute
      return service_response_error("You don't have access to this package", 403) unless user_can_delete_package?

      package.pending_destruction!

      package.mark_package_files_for_destruction
      package.sync_maven_metadata(current_user)
      package.sync_npm_metadata_cache

      service_response_success('Package was successfully marked as pending destru
    
    def execute
      return service_response_error("You don't have access to this package", 403) unless user_can_delete_package?

      package.pending_destruction!

      package.mark_package_files_for_destruction
      package.sync_maven_metadata(current_user)
      package.sync_npm_metadata_cache

      service_response_success('Package was successfully marked as pending destruction')
    rescue StandardError => e
      track_exception(e)
      service_response_error('Failed to mark the package as pending destruction', 400)
    end

    private

    def service_response_error(message, http_status)
      ServiceResponse.error(message: message, http_status: http_status)
    end

    def service_response_success(message)
      ServiceResponse.success(message: message)
    end

    def user_can_delete_package?
      can?(current_user, :destroy_package, package.project)
    end

    def track_exception(error)
      Gitlab::ErrorTracking.track_exception(
        error,
        project_id: package.project_id,
        package_id: package.id
      )
    end
  end