Remove git.Command.Run and git.Command.RunInDir* (#19280)

Follows #19266, #8553, Close #18553, now there are only three `Run..(&RunOpts{})` functions.
 * before: `stdout, err := RunInDir(path)`
 * now: `stdout, _, err := RunStdString(&git.RunOpts{Dir:path})`

services/pull/pull.go

@@ -479,7 +479,7 @@ func UpdateRef(ctx context.Context, pr *models.PullRequest) (err error) {
 		return err
 	}
 
-	_, err = git.NewCommand(ctx, "update-ref", pr.GetGitRefName(), pr.HeadCommitID).RunInDir(pr.BaseRepo.RepoPath())
+	_, _, err = git.NewCommand(ctx, "update-ref", pr.GetGitRefName(), pr.HeadCommitID).RunStdString(&git.RunOpts{Dir: pr.BaseRepo.RepoPath()})
 	if err != nil {
 		log.Error("Unable to update ref in base repository for PR[%d] Error: %v", pr.ID, err)
 	}