Improve CSS to handle not having actions

As mentioned in #1589 (closed), in this comment https://gitlab.com/gitlab-org/gitlab-ee/issues/1589#note_24374957:

Since we don't have deployboard actions yet, it creates unnatural padding on the right. Can we remove it for now, until we fill that space with buttons?

With buttons	Without buttons

To have local mock data: in this file: app/assets/javascripts/vue_shared/vue_resource_interceptor.js.es6

paste this for an environment with a deploy board: https://gitlab.com/snippets/1619567

In the same file, for a response with instances paste this: https://gitlab.com/snippets/1619164