Add internal-repo octicon for public repos of private org (#11529)

* Show multiple octicons on repo list

* fix mixed spaces/tabs

* Internal repo octicon

* show internal icon in dashboard repolist

* swagger

* fix icon for normal repo on repo page

* don't expose owner visibility directly; provide internal in repo api

* fix icons for forks and mirrors

Co-authored-by: Lauris BH <lauris@nix.lv>

models/repo.go

@@ -405,6 +405,7 @@ func (repo *Repository) innerAPIFormat(e Engine, mode AccessMode, isParent bool)
 		AllowRebaseMerge:          allowRebaseMerge,
 		AllowSquash:               allowSquash,
 		AvatarURL:                 repo.avatarLink(e),
+		Internal:                  !repo.IsPrivate && repo.Owner.Visibility == api.VisibleTypePrivate,
 	}
 }