Move some functions to gitrepo package (#35543)

Refactor Git command functions to use WithXXX methods instead of
exposing RunOpts.
This change simplifies reuse across gitrepo and improves consistency,
encapsulation, and maintainability of command options.

---------

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

modules/git/pipeline/lfs_nogogit.go

@@ -33,11 +33,11 @@ func FindLFSFile(repo *git.Repository, objectID git.ObjectID) ([]*LFSResult, err
 
 	go func() {
 		stderr := strings.Builder{}
-		err := gitcmd.NewCommand("rev-list", "--all").Run(repo.Ctx, &gitcmd.RunOpts{
-			Dir:    repo.Path,
-			Stdout: revListWriter,
-			Stderr: &stderr,
-		})
+		err := gitcmd.NewCommand("rev-list", "--all").
+			WithDir(repo.Path).
+			WithStdout(revListWriter).
+			WithStderr(&stderr).
+			Run(repo.Ctx)
 		if err != nil {
 			_ = revListWriter.CloseWithError(gitcmd.ConcatenateError(err, (&stderr).String()))
 		} else {