Fix wrong display of recently pushed notification (#25812) (#31043)

Backport #25812

~~ps: removed some new codes in `tests/integration/pull_merge_test.go`~~

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/fixtures/branch.yml

@@ -45,3 +45,39 @@
   is_deleted: false
   deleted_by_id: 0
   deleted_unix: 0
+
+-
+  id: 5
+  repo_id: 10
+  name: 'master'
+  commit_id: '65f1bf27bc3bf70f64657658635e66094edbcb4d'
+  commit_message: 'Initial commit'
+  commit_time: 1489927679
+  pusher_id: 12
+  is_deleted: false
+  deleted_by_id: 0
+  deleted_unix: 0
+
+-
+  id: 6
+  repo_id: 10
+  name: 'outdated-new-branch'
+  commit_id: 'cb24c347e328d83c1e0c3c908a6b2c0a2fcb8a3d'
+  commit_message: 'add'
+  commit_time: 1489927679
+  pusher_id: 12
+  is_deleted: false
+  deleted_by_id: 0
+  deleted_unix: 0
+
+-
+  id: 14
+  repo_id: 11
+  name: 'master'
+  commit_id: '65f1bf27bc3bf70f64657658635e66094edbcb4d'
+  commit_message: 'Initial commit'
+  commit_time: 1489927679
+  pusher_id: 13
+  is_deleted: false
+  deleted_by_id: 0
+  deleted_unix: 0