Add search mode option to /api/repo/search (#2756)

* Add repo type option to /api/repo/search

* Add tests and fix result of collaborative filter in specific condition

* Fix/optimize search & tests

* Improve integration tests

* Fix lint errors

* Fix unit tests

* Change and improve internal implementation of repo search

* Use NonexistentID

* Make search api more general

* Change mirror and fork search behaviour

* Fix tests & typo in comment

models/fixtures/org_user.yml

@@ -44,4 +44,12 @@
   org_id: 17
   is_public: false
   is_owner: true
+  num_teams: 1
+
+-
+  id: 7
+  uid: 20
+  org_id: 19
+  is_public: true
+  is_owner: true
   num_teams: 1