Some refactor for repo path (#36251)

- Use `gitrepo.IsRepositoryExist` instead of `util.IsExit` or
`util.IsDir`
- Use `gitrepo.OpenRepository` instead of `git.OpenRepository`
- Use `gitrepo.DeleteRepository` instead of `util.RemoveAll`
- Use `gitrepo.RenameRepository` instead of `util.Rename`

services/migrations/gitea_uploader.go

@@ -8,8 +8,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"os"
-	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -589,12 +587,7 @@ func (g *GiteaLocalUploader) updateGitForPullRequest(ctx context.Context, pr *ba
 		}
 		defer ret.Close()
 
-		pullDir := filepath.Join(g.repo.RepoPath(), "pulls")
-		if err = os.MkdirAll(pullDir, os.ModePerm); err != nil {
-			return err
-		}
-
-		f, err := os.Create(filepath.Join(pullDir, fmt.Sprintf("%d.patch", pr.Number)))
+		f, err := gitrepo.CreateRepoFile(ctx, g.repo, fmt.Sprintf("pulls/%d.patch", pr.Number))
 		if err != nil {
 			return err
 		}