Remove migrations from setup_postgresql

lib/tasks/migrate/setup_postgresql.rake

 desc 'GitLab | Sets up PostgreSQL'
 task setup_postgresql: :environment do
-  require Rails.root.join('db/migrate/20151007120511_namespaces_projects_path_lower_indexes')
-  require Rails.root.join('db/migrate/20151008110232_add_users_lower_username_email_indexes')
-  require Rails.root.join('db/migrate/20161212142807_add_lower_path_index_to_routes')
-  require Rails.root.join('db/migrate/20170317203554_index_routes_path_for_like')
-  require Rails.root.join('db/migrate/20170724214302_add_lower_path_index_to_redirect_routes')
-  require Rails.root.join('db/migrate/20170503185032_index_redirect_routes_path_for_like')
-  require Rails.root.join('db/migrate/20171220191323_add_index_on_namespaces_lower_name.rb')
   require Rails.root.join('db/migrate/20180215181245_users_name_lower_index.rb')
   require Rails.root.join('db/migrate/20180504195842_project_name_lower_index.rb')
   require Rails.root.join('db/post_migrate/20180306164012_add_path_index_to_redirect_routes.rb')
 
-  NamespacesProjectsPathLowerIndexes.new.up
-  AddUsersLowerUsernameEmailIndexes.new.up
-  AddLowerPathIndexToRoutes.new.up
-  IndexRoutesPathForLike.new.up
-  AddLowerPathIndexToRedirectRoutes.new.up
-  IndexRedirectRoutesPathForLike.new.up
-  AddIndexOnNamespacesLowerName.new.up
   UsersNameLowerIndex.new.up
   ProjectNameLowerIndex.new.up
   AddPathIndexToRedirectRoutes.new.up