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>

modules/structs/repo.go

@@ -88,6 +88,7 @@ type Repository struct {
 	AllowRebaseMerge          bool             `json:"allow_rebase_explicit"`
 	AllowSquash               bool             `json:"allow_squash_merge"`
 	AvatarURL                 string           `json:"avatar_url"`
+	Internal                  bool             `json:"internal"`
 }
 
 // CreateRepoOption options when creating repository