Rename Browser Performance template jobs

Changelog: changed

lib/gitlab/ci/templates/Jobs/Browser-Performance-Testing.gitlab-ci.yml

 # Read more about the feature here: https://docs.gitlab.com/ee/user/project/merge_requests/browser_performance_testing.html
 
-performance:
+browser_performance:
   stage: performance
   image: docker:19.03.12
   allow_failure: true

lib/gitlab/ci/templates/Verify/Browser-Performance.gitlab-ci.yml

@@ -6,7 +6,7 @@ stages:
   - deploy
   - performance
 
-performance:
+browser_performance:
   stage: performance
   image: docker:git
   variables: