Elements inside the DevTools shouldn't be focusable when the DevTools are closed

[sdelpuerto-intelygenz]

Currently if you try to cycle the focus through all the elements in the page, for a while it seems like nothing is happening. In reality, what's happening is all the elements inside the DevTools are getting focused even though they're not visible.

Obviously this component is not meant to ever be seen by end users, but it's really annoying to test accessibility during development when this component is mounted.