Merge branch 'g339214-unique-filenames' into 'master'

Ensures unique file names for merge requests

See merge request gitlab-org/gitlab!69006

qa/qa/specs/features/ee/browser_ui/4_verify/pipelines_for_merged_results_and_merge_trains_spec.rb

@@ -45,7 +45,7 @@ module QA
           merge_request.project = project
           merge_request.description = Faker::Lorem.sentence
           merge_request.target_new_branch = false
-          merge_request.file_name = Faker::Lorem.word
+          merge_request.file_name = Faker::File.unique.file_name
           merge_request.file_content = Faker::Lorem.sentence
         end
       end