Fix incorrect pull request counter (#35819)

Fix #35781, #27472

The PR will not correct the wrong numbers automatically. 

There is a cron task `check_repo_stats` which will be run when Gitea
start or midnight. It will correct the numbers.

models/actions/main_test.go

@@ -13,6 +13,8 @@ func TestMain(m *testing.M) {
 	unittest.MainTest(m, &unittest.TestOptions{
 		FixtureFiles: []string{
 			"action_runner_token.yml",
+			"action_run.yml",
+			"repository.yml",
 		},
 	})
 }