Make sure end-to-end test uses unique filename in metrics test

Signed-off-by: Rémy Coutable <remy@rymai.me>

qa/qa/page/project/operations/metrics/show.rb

 # frozen_string_literal: true
 
+require 'securerandom'
+
 module QA
   module Page
     module Project
@@ -60,7 +62,7 @@ module QA
             def duplicate_dashboard(save_as = 'test_duplication.yml', commit_option = 'Commit to master branch')
               click_element :dashboards_filter_dropdown
               click_on 'Duplicate dashboard'
-              fill_element :duplicate_dashboard_filename_field, save_as
+              fill_element :duplicate_dashboard_filename_field, "#{SecureRandom.hex(8)}-#{save_as}"
               choose commit_option
               within('.modal-content') { click_button(class: 'btn-success') }
             end