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>

templates/swagger/v1_json.tmpl

@@ -14056,6 +14056,10 @@
           "type": "boolean",
           "x-go-name": "IgnoreWhitespaceConflicts"
         },
+        "internal": {
+          "type": "boolean",
+          "x-go-name": "Internal"
+        },
         "internal_tracker": {
           "$ref": "#/definitions/InternalTracker"
         },