Add API for manipulating Git hooks (#6436)

* Add API for manipulating Git hooks

Signed-off-by: Segev Finer <segev@codeocean.com>

* Replace code.gitea.io/sdk with PR branch temporarily for CI

* Switch back to code.gitea.io/sdk@master

* Return 403 instead of 404 on no permission to edit hooks in API

* Add tests for Git hooks API

* Update models/repo_list_test.go

Co-Authored-By: segevfiner <segev208@gmail.com>

* Update models/repo_list_test.go

Co-Authored-By: segevfiner <segev208@gmail.com>

* empty line

models/fixtures/repository.yml

@@ -441,3 +441,14 @@
   num_forks: 0
   num_issues: 0
   is_mirror: false
+
+-
+  id: 37
+  owner_id: 2
+  lower_name: git_hooks_test
+  name: git_hooks_test
+  is_private: false
+  num_stars: 0
+  num_forks: 0
+  num_issues: 0
+  is_mirror: false