Allow links in job log output to be clicked

Problem to solve

Sometimes our job logs include links, like this:

It would be cool if these links could be clicked and followed. Right now, to follow the link, the user has to copy/paste the link from the output into the address bar.

Intended users

gitlab-ce~9335216

Proposal

Make links in job output clickable. Clicking the link should open the link in a new tab.

Further details

Perhaps the link should only become enabled when Ctrl or Cmd is pressed - this would be similar to how iTerm handles links.