Fix Profiler to work with Rails 5.1

Rails 5.1 now requires keyword arguments to pass along parameters and headers for ActionDispatch::Integration::RequestHelpers.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61051

5.1.7: https://github.com/rails/rails/blob/4f66945cd038bda638fc6729e0d54663d0dfbf22/actionpack/lib/action_dispatch/testing/integration.rb#L15-L17

5.0.7.2: https://github.com/rails/rails/blob/c4d3e202e10ae627b3b9c34498afb45450652421/actionpack/lib/action_dispatch/testing/integration.rb#L14-L16