Fix project queued for deletion re-creation tooltip

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17235

Adds a nicer message if the project being created is an older project pending to be deleted.

New, more explicit, message:

• CHANGELOG entry added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together