Remove unused add_member flow method

qa/qa/flow/project.rb

@@ -5,16 +5,6 @@ module QA
     module Project
       module_function
 
-      def add_member(project:, username:)
-        project.visit!
-
-        Page::Project::Menu.perform(&:click_members)
-
-        Page::Project::Members.perform do |member_settings|
-          member_settings.add_member(username)
-        end
-      end
-
       def go_to_create_project_from_template
         if Page::Project::NewExperiment.perform(&:shown?)
           Page::Project::NewExperiment.perform(&:click_create_from_template_link)