Pull request updates will also trigger code owners review requests (#33744) (#34045)

Fix #33490
Backport #33744 

It will only read the changed file on the pushed commits but not all the
files of this PR.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/repository/push.go

@@ -170,7 +170,6 @@ func pushUpdates(optsList []*repo_module.PushUpdateOptions) error {
 			branch := opts.RefFullName.BranchName()
 			if !opts.IsDelRef() {
 				log.Trace("TriggerTask '%s/%s' by %s", repo.Name, branch, pusher.Name)
-				go pull_service.AddTestPullRequestTask(pusher, repo.ID, branch, true, opts.OldCommitID, opts.NewCommitID)
 
 				newCommit, err := gitRepo.GetCommit(opts.NewCommitID)
 				if err != nil {
@@ -212,6 +211,17 @@ func pushUpdates(optsList []*repo_module.PushUpdateOptions) error {
 						log.Error("IsForcePush %s:%s failed: %v", repo.FullName(), branch, err)
 					}
 
+					// only update branch can trigger pull request task because the pull request hasn't been created yet when creaing a branch
+					go pull_service.AddTestPullRequestTask(pull_service.TestPullRequestOptions{
+						RepoID:      repo.ID,
+						Doer:        pusher,
+						Branch:      branch,
+						IsSync:      true,
+						IsForcePush: isForcePush,
+						OldCommitID: opts.OldCommitID,
+						NewCommitID: opts.NewCommitID,
+					})
+
 					if isForcePush {
 						log.Trace("Push %s is a force push", opts.NewCommitID)